"A rocket flies toward the earth at 0.5c and the captain shines a laser light beam in the forward direction.Which of the following statements about the speed of this light are correct? (There may be more than one correct answer.)An observer on earth measures speed 1.5c for the light.The captain measures speed 0.5c for the light.The captain measures speed c for the light.An observer on earth measures speed c for the light."

The temperature which is lowest among these given values will be 270K, which means option B is the right answer.

Temperature is defined as the degree of hotness or coldness of an object. It means that the amount of energy which is stored in it to increase its degree of hotness.

In the given problem, the values are given in different systems. So to determine that which one is smaller, first we convert them into Celsius, so that all the units are same.

The relation between Fahrenheit and celcius is given as follows:

Temperature in celsius = 5/9(temperature in Fahrenheit - 32)

∴ Temperature in celsius = 5/9(32 - 32) = 0 Celsius

The relation between Kelvin and Celsius is given as :

Temperature in Celsius = Temperature in Kelvin - 273.15

∴ Temperature in Celsius = 270 - 273.15 = -3.15 Celsius

273 K will be equal to 0 Celsius using above relation.

Hence all the values are equal to zero except 270 K which is negative, hence coldest.

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Frequency of Simple pendulum = 0.61 Hz. The pendulum oscillates with a frequency of v = ω/2π, cycles per second, and its period, T, is equal to 2π(l/g).

As a result, the pendulum's frequency determines how frequently it swings back and forth during a certain length of time. How many times the pendulum swings back and forth in 60 seconds, for instance. The length of pendulum will affect its frequency. It implies that the swing rate will be higher and the pendulum shorter.

Number of oscillations that were completed in the given unit of time. f = 1/T = ω/2π 4. Period of time (T) T = 2 π/ω.

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A projectile was fired with initial velocity of 40 m/s and at angle 30⁰ above the horizontal. Its initial vertical velocity is 20 m/s.

In a projectile motion, at a time instant t, the velocity v can be divided into its horizontal and vertical components: vx and vy. Let the projectile is fired at angle θ above the horizontal, then:

vx = v cos  θ

vy = v sin  θ

Where:

v = velocity at time instant t

Parameters given:

v = 40 m/s

θ = 30⁰

Hence, the vertical velocity is:

vy = v sin 30⁰

    = 40 . 1/2 = 20 m/s

Complete question:

Determine the magnitude of the initial vertical velocity of the projectile, vy, when the magnitude of its initial velocity, v, was 40. meters per second and the angle is 30⁰ above the horizontal.

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Answer:

the pulley system is very efficient

Explanation:

Given;

load, L  = 250 N

distance moved by the load, a = 4.5 m

distance moved by the effort, e = 2.5 m

let the force or effort applied = F

Apply the principle of conservation of energy;

F x e = L x a

F = (L x a) / e

F = (250 x 4.5) / 2.5

F = 450 N

The efficient of the pulley system;

E = Output force / Input force

E = (450 x 2.5) / (250 x 4.5)

E = 1 = 100%

Therefore, the pulley system is very efficient

Answer:

Explanation:

right

Answer:

B

Explanation:

The question does not specify any outside forces that could slow down the ball horizontally. There fore the ball does not accelerate or decelerate horizontally. Therefore,  a = 0m/s2

Descending intervals are calculated in the same way as ascending intervals, but with the direction reversed. The only difference is that ascending intervals go up in pitch, while descending intervals go down in pitch. So, This statement is false

Descending intervals are calculated differently from ascending ones.
When calculating ascending intervals, you count the distance between two notes in an upward direction (from a lower pitch to a higher pitch). For example, the interval from C to E is an ascending major third.
On the other hand, when calculating descending intervals, you count the distance between two notes in a downward direction (from a higher pitch to a lower pitch). For example, the interval from E to C is a descending major third.
The process of counting the distance is different between ascending and descending intervals, making them calculated differently.

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We never see the Moon next to Polaris (the North Star) because the Moon's orbit around the Earth is not aligned with the Earth's rotation axis. Instead, the Moon's orbit is inclined at an angle of about 5 degrees to the Earth's orbit around the Sun.

This means that the Moon appears to move across the sky along a path that is inclined at a similar angle to the Earth's equator. Polaris, on the other hand, appears to remain in a fixed position relative to the Earth's rotation axis. As a result, the Moon and Polaris appear to move along different paths in the sky and are unlikely to be seen next to each other.

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Answer:

In the core of the Sun hydrogen is being converted into helium. This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom. During the process some of the mass is converted into energy.

Answer:

Hydrogen in the middle of the sun is being converted into helium. This helium that was just converted from hydrogen (air as we know it) is now called Nuclear Fusion.

Explanation:

Answer:

Explanation:

Sprouted seeds - are the best for health.

I hope it helps! Please mark my answer answer as bräinliest (if my answer is correct). Thank You!

Explanation:

Qualitative is to observe and note a quality about something - like the paper airplanes are made out of "white" paper. White is a qualitative property.

Quantitative is to observe and measure a value - like the time of flight of a paper airplane.

Options A, B & D are true.

We are dealing with the concept of inertia.

This means that inertia is the force that keeps an object at rest or in constant motion.

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Answer:

La tensión es 85.3 N.

Explanation:

Cuando el objeto gira en dirección horizontal, la sumatoria de fuerzas se puede calcular usando la segunda ley de Newton:  

\( \Sigma F_{x} =ma_{c} \)

\( T = ma_{c} \)  

Dado que el movimiento es horizontal, el peso (que está en el eje y) no contribuye en la sumatoria de fuerzas en el eje x. Por lo que la única fuerza actuando sobre el objeto en la dirección del movimiento es la tensión.  

En donde:                                          

m: es la masa del objeto = 200 g = 0.200 kg

\(a_{c}\): es la aceleración centrípeta

La aceleración centrípeta viene dada por:  

\(a_{c} = \omega^{2} r\)

En donde:    

ω: es la velocidad angular del objeto = 3 rev/s

r: es el radio = 1.20 m

Entonces, la tensión es:

\(T = m\omega^{2} r = 0.200 kg(3\frac{rev}{s}*\frac{2\pi rad}{1 rev})^{2}*1.20 m = 85.3 N\)

Por lo tanto, la tensión es 85.3 N.  

Espero que te sea de utilidad!                                                                          

Answer:

Crude oils

Explanation:

The correct word should be crude oils.

Crude oil is a non-renewable resource that is geologically formed and found deep in the ground. It is a naturally occurring mixture of hydrocarbons and usually fractionated to serve different purposes for the use of man. Crude oils are non-renewable because the rate at which humans exploit them is quite faster than the rate at which they are being naturally replenished deep in the ground.

Answer:

8m/s

Explanation:

because frequency×wavelength

Answer:

Tension.

tension is the name of force that opposes or goes opposite of gravity

Hope this helps!

Answer: Friction

Explanation: Friction opposes gravity and any motion in two surfaces.

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Answer:

A) Sue is lifting the bucket by a force of 49.035 newtons.

B) The bucket has an acceleration of 8.207 meters per square second on the Moon.

Explanation:

A) According to the First Newton's Law, a system is at equilibrium when it is either at rest or travelling at constant velocity. In this case, Sue must exert an external force on the bucket, whose magnitude is equal to the weight of the bucket but direction is opposed to it. By Second Newton's Law, we find that:

\(\Sigma F = F - m\cdot g = 0\) (1)

Where:

\(F\) - Lifting force, measured in newtons.

\(m\) - Mass of the bucket, measured in kilograms.

\(g\) - Gravitational acceleration, measured in meters per square second.

If we know that \(m = 5\,kg\) and \(g = 9.807\,\frac{m}{s^{2}}\), then the lifting force is:

\(F = m\cdot g\)

\(F = (5\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)\)

\(F = 49.035\,N\)

Sue is lifting the bucket by a force of 49.035 newtons.

B) By the Second Newton's Law, we have the following model:

\(\Sigma F = F-m\cdot g = m\cdot a\) (2)

Where \(a\) is the net acceleration of the bucket, measured in meters per square second.

If we know that \(F = 49.035\,N\), \(m = 5\,kg\) and \(g = 1.6\,\frac{m}{s^{2}}\), then the net acceleration of the bucket is:

\(a = \frac{F}{m} -g\)

\(a = \frac{49.035\,N}{5\,kg}-1.6\,\frac{m}{s^{2}}\)

\(a = 8.207\,\frac{m}{s^{2}}\)

The bucket has an acceleration of 8.207 meters per square second on the Moon.

(a) The force applied by Sue in lifting the bucket at a constant velocity is 49 N.

(b) The acceleration of the bucket when lifted on the moon is 8.2 m/s².

The given parameters;

The force applied by Sue in lifting the bucket at a constant velocity is calculated as;

\(F = m(a + g)\)

\(F= mg\\\\F = 5 \times 9.8\\\\F = 49 \ N\)

The acceleration of the bucket when lifted on the moon with the calculated force is;

\(F = m(a + g)\\\\a+g = \frac{F}{m} \\\\a = \frac{F}{m} - g\\\\a = \frac{49}{5} - 1.6\\\\a = 8.2 \ m/s^2\)

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Answer:

The correct option is;

The assertion is correct, but reason wrong

Explanation:

The question is with regards to the relationship between work, energy, power, and velocity

The mass of each of the persons running up the staircase = Different

The time it takes each person to run up the stairs = Equal time

Let, 'm₁' and 'm₂' represent the mass of each of the persons that ran up the stairs and m₁ > m₂

Let 't' represent the equal time it takes then to run up the stairs

Let 'h' represent the height of the stairs

The energy, 'E', it takes to run up the stairs is equal to the potential energy, P.E., obtained at the top of the stairs

P.E. = m·g·h

Where;

m = The mass of the person at an elevated height

g = The acceleration due to gravity = Constant

h = The height reached above ground level

Given that the height reached is the same for both of the persons, we have

For m₁, P.E.₁ = m₁·g·h and for m₂, P.E.₂ = m₂·g·h

Therefore, where, m₁ > m₂, we have;

P.E.₁ > P.E.₂

∴ E₁ > E₂

Power, 'P', is the rate at which energy is expended

∴ Power, P = E/t

∴ P₁ = E₁/t  > P₂ = E₂/t

Therefore, the person with the greater mass, 'm₁', uses more power than the person of mass 'm₂', in running up the stairs

Therefore, the assertion is correct

The average velocity, vₐ = (Total distance traveled, d)/(Total time taken, t)

Given that the distance, 'd', covered in running up the stairs by both persons is the same, and the time it takes them to complete the distance, 't', is also the same, we have;

The average velocity of the person with the greater mass m₁ is the same as the average velocity of the person with mass, m₂

Therefore, the reason is wrong

The answer is that the assertion is correct, but reason wrong

You'll move more quickly and halt farther away thanks to gravity. To slow down to a safe speed and keep control of your car, you might need to downshift or gently apply the breaks.

Gravity aids you in stopping attempts and shortens the stopping distance when you are traveling uphill. When you are descending, gravity also works against you and lengthens your stopping distance. The next factor that can affect your braking distance is the friction between the road and your tires. The amount of time it takes to stop a moving object is related to the square of the starting speed of the vehicle and relies on how quickly it was moving before the brakes were applied. Hence, even little speed increases result in noticeably larger stopping distances. The distance covered while using the brakes is the braking distance. Speed and drag are two variables that influence it.

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Answer:

\(Q_t= 8.3 * 10^3 C\)

Explanation:

From the question we are told that:

Resistor \(R=1000ohms\)

Voltage \(v=120_V\)

Capacitance of c_1 \(c_1=20 \mu F\)

Capacitance of c_2 \(c_2=60 \mu F\)

Time \(t=0\)

Generally the equation for charges is mathematically given by

\(For C_1\\Charge\ on\ C_1 = CV = 20*120 = 2400 μC = 2.4 x 10^-3 C\\Charge\ on\ C_1 = 2400 μC = 2.4 x 10^-3 C\\Charge\ on\ C_1 = 2.4 x 10^-3 C\\\)

\(ForC_2\\Charge on C_2 = 60*120 =7200 μC = 7.2 x 10^-3\\Charge on C_2 = 7.2 x 10^-3\)

Generally the equation for voltage across capacitors is mathematically given by

\(V_c(t)=V(1-e^{-t/RC})\)

\(C=C_1+C_2=80 \mu f\\t=2RC=>160000s\)

\(V_c(t)=120(1-e^{-(160000)/1000*(80)})\)

\(V_c(t)=103.7598\)

Generally the equation for charges is mathematically given by

\(Q1(t) = C1Vc(t)\\Q1(t) = 20*103.7598\\Q1(t) = 2075.196\\\\Q2(t) = 60*103.7598\\Q2(t) = 6225.6\\\)

Generally the equation for total charges \(Q_t\) is mathematically given by

\(Q_t=Q1(t)+Q2(t)\)

\(Q_t= 8.3 * 10^3 C\)

The spring stiffness is quantified through the spring constant, or k. For diverse springs and materials, it varies. The stiffer the spring is and the more difficult it's far to stretch, the bigger the spring constant.

What is the spring constant?

The spring constant is the force needed to stretch or compress a spring, divided by the distance that the spring gets longer or shorter. It's used to determine stability or instability in spring, and therefore the system it's intended for.

The spring stiffness is quantified by the spring constant or k. For various springs and materials, it varies. The stiffer the spring is and the harder it is to stretch, the larger the spring constant.

F = -kx. The term "spring constant" refers to the proportional constant k. It gauges the stiffness of the spring. A spring exerts a force F = -kx in the direction of its equilibrium position when it is stretched or compressed to a length that differs by an amount x from its equilibrium length. A large value of k indicates that more force is needed to stretch it a given distance than would be necessary to stretch a less stiff spring the same distance.

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B sediment is eroded from rock

Answer:

B) sediment is eroded from rock

Explanation:

edge 2020

Answer:

get it done for free on www.brainly.com

Explanation:

Answer:

I will give you $0

Explanation:

I have hardly any money and I don't feel like giving you any.

You can do my work for $0

Thanks! :)

The diameter of the cylinder is 2.49 meters if the cylinder is 4872 N and the cylinder exerts a pressure of 812 N/m2. on the ground.

First, we need to find the area of the base of the cylinder that is in contact with the ground. To do this, we can use the formula for pressure: Pressure = Force/Area. Rearrange the formula to solve for Area: Area = Force/Pressure.
Given:
Force exerted by the cylinder (N) = 4872 N
Pressure exerted by the cylinder (N/m^{2}) = 812 N/m^{2}
Calculate the Area:
Area = Force/Pressure = 4872 N / 812 N/m^{2} = 6 m^{2}
Now, we know the area of the base of the cylinder. Since the base is a circle, we can use the formula for the area of a circle: Area = π * (diameter/2)^{2}. Rearrange the formula to solve for diameter: Diameter = 2 * √(Area/π).
Calculate the Diameter:
Diameter = 2 * √(6 m^2/π) ≈ 2.49 meters
The diameter of the cylinder, to 2 decimal places, is approximately 2.49 meters.

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Explanation:

given that the raven flies south for

time= 10 sec

speed= 10km/s

we know that speed=distance/time

distance=speed*time

distance=10*100

distance=1000m

distance=1km

also flies

distance=0.5km = 500m

time= 50 sec

speed= distance/time

speed=500/50

speed= 10m/s

speed= 0.01km/s

The average speed of an object is defined as the distance traveled divided by the time elapsed.

average speed= (1000+500)/10+50

average speed= (1500)/60

average speed= 25m/s

average velocity= (10km/s+0.01km/s)/2= 10.01/2= 5.005km/s

The initial temperature of the hot glass prism was 81.2°C.

A transparent object having two triangular ends and three rectangular sides is known as glass prism.

As we know, Q = mcΔT

Q is heat transferred, m is the of the water, c is specific heat capacity of water, ΔT is change in temperature of the water.

Assuming no heat is lost to the surroundings, heat lost by hot glass prism is equal to heat gained by the water:

Q_lost = Q_gained

Heat lost by the hot glass prism can be calculated as: Q_lost = mcΔT

m is mass of the glass prism and ΔT is difference between initial temperature of prism (T_i) and final temperature of the water (25°C).

Heat gained by the water can be calculated as: Q_gained = mcΔT

m is mass of the water and c is specific heat capacity of water.

mcΔT = mcΔT_g

T_i = (ΔT_g / ΔT) x 25°C

Heat transferred from the glass prism to water is: Q = mcΔT = 100 g x 0.664 J/(g °C) x (25°C - T_i)

ΔT_g = T_i - T_hot = - (25°C - T_i)

100 g x 0.664 J/(g °C) x (25°C - T_i) = 300 g x 4.184 J/(g °C) x (25°C - 22°C)

T_i = 81.2°C

Therefore,  initial temperature of the hot glass prism was 81.2°C.

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Answer:

this is an example of acceleration

Answer:

A rotating fan completes 1200 revolutions every minute. Consider the tip of a blade, at a radius of 0.15 m.

Explanation:

The tangential velocity at the point, 0.16 m from the axis is 13.44 m/s.

We have the following information;

Angular speed of the blade = 800rev/min

Radius of the point under consideration = 0.16m

We have to convert the angular velocity to units of rad/s

Given that;

1 rev/min = 0.105 rad/s

800rev/min = 800rev/min × 0.105 rad/s/1 rev/min

= 84 rad/s

Now;

v = rω

v = Tangential velocity

r = radius

ω = angular velocity

v =  0.16m × 84 rad/s

v = 13.44 m/s

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