A mass of (200 g) of hot water at (75.0°C) is mixed with cold water of mass M at (5.0°C). The final temperature of the mixture is (25.0°C). What is the mass of the cold water (M)?

Answer:

Must include: 21

Explanation:

a)It takes 0 seconds for the stone to hit the ground.

b)The stone has traveled 19.6 meters after 2 seconds.

When an object is dropped from a height, the motion is described as free fall. It is a special form of motion in which an object is under the sole influence of gravity. The gravitational force acting on an object is always directed towards the center of the Earth, i.e., downwards. Therefore, when an object is dropped from a height, it falls freely towards the ground, and the acceleration of the object is equal to the acceleration due to gravity, which is approximately 9.8 m/s².

In the problem given, a stone is dropped from rest from the top of a higher tower. Therefore, the initial velocity of the stone, u = 0 m/s.

a. Time taken by the stone to reach the ground:
We can use the following equation of motion to calculate the time taken by the stone to reach the ground.
v = u + at

where,
v = final velocity of the object
u = initial velocity of the object
a = acceleration of the object
t = time taken by the object to reach from initial velocity to final velocity

Since the stone is dropped from rest, the initial velocity of the stone, u = 0 m/s.

At the ground level, the final velocity of the stone, v = ?
Again, the acceleration due to gravity, a = 9.8 m/s².

Therefore, we can write the equation as:

v = u + at
v = 0 + 9.8×t
v = 9.8t m/s

When the stone hits the ground, the final velocity of the stone, v = 0 m/s.

Therefore, we can rewrite the equation as:

0 = 9.8t
t = 0 seconds (when the stone is at the top of the tower)

We have found that it takes 0 seconds for the stone to hit the ground.

b. How far the stone has travelled after 2 seconds:
We can use the following equation of motion to calculate how far the stone has travelled after 2 seconds.
s = ut + (1/2)at²

where,
s = displacement of the object
u = initial velocity of the object
a = acceleration of the object
t = time taken by the object to reach from initial velocity to final velocity

Since the stone is dropped from rest, the initial velocity of the stone, u = 0 m/s.

The acceleration due to gravity, a = 9.8 m/s².

Therefore, we can write the equation as:

s = ut + (1/2)at²
s = 0×2 + (1/2)×9.8×(2)²
s = 19.6 m

Therefore, the stone has traveled 19.6 meters after 2 seconds.

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The Kinetic friction force on her  84.05 N.

Kinetic friction is defined as a force that acts between shifting surfaces. A body moving at the surface reports pressure inside the contrary path of its motion. The significance of the pressure will rely on the coefficient of kinetic friction between the 2 materials.

In static friction, the frictional force resists pressure this is applied to an item, and the object stays at relaxation until the force of static friction is conquered. In kinetic friction, the frictional force resists the motion of an item.

Kinetic friction is produced whilst brakes are applied to tires, when an item like a field slides throughout the floor, or whilst sandpaper is rubbed throughout a surface.

calculation:-

μ = 0.25

mass = 41 kg

θ = 35°

N = 410 cos 35° N

    = 410 × 0.82 N

    = 336.2 N

F = μkN

   = 0.25 × 336.2 N

Kinetic friction force = 84.05 N

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The charge of the capacitive series circuit with a battery of 240v connected to it is 3.47×10⁻⁴ C.

Charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field.

To calculate the charge, we use the formula below

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

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Given the inequality:

Let's solve the inequality for x.

To solve the inequality, multiply both sides by 2.5:

Answer:

B, the internet serves to provide people with more insightful explanations on things that they have not experienced yet but want to find out more on.

Answer:

Explanation: y’all taking the same test as me hahahahah I got the answers but I can’t attach the picture here so hit me up on snap daniela_0789

The total energy at each point in the path of the skier is constant as the

skier travels down the slope.

Reasons:

1) Given that the total mechanical energy, M.E. is constant, we have;

M.E. = Kinetic Energy, K.E. + Potential Energy, P.E. = Constant

M.E. = K.E. + P.E.

At the start, we have;

P.E. = 25,000 J

K.E. = 0 J

Therefore;

M.E. = 25,000 J + 0 J = 25,000 J

At point 1A, we have, K.E = 10,000 J

P.E. = M.E. - K.E.

Therefore;

P.E. = 25,000 - 10,000 = 15,000

The potential energy at point 1A, P.E. = 15,000 J

At point 1B, we have; PE = 6000 J

K.E. = M.E. - P.E.

Therefore;

K.E. = 25,000 J - 6,000 J = 19,000 J

At 1B, K.E. = 19,000 J

At point 1C, we have; K.E. = 25,000 J

Therefore;

P.E. = 25,000 J - 25,000 J = 0 J

At 1C P.E. = 0 J

2) The Law of Conservation of Energy states that the energy in a closed

system is constant.

The energy transformation follows the Law of Conservation of energy

given that the total mechanical energy is constant at all points along the

path.

3) The energy of a system is not conserved when a external force is

applied.

If the skier experiences friction, the force of friction does work to reduce

the speed of the skier, thereby reducing the kinetic energy at a point

downslope, where the potential energy has already been reduced,

resulting in an reduction in the mechanical energy of the system.

Therefore, if the skier experiences friction, the total energy of the system is

not conserved, as energy will be consumed in the work done by friction

which is converted to heat and sound energies.

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Answer:

D. 1.17 J

Explanation:

The potential energy stored in a spring is given by the following:

U = (K•x²)/2

U -> elastic Potential energy

K -> spring constant

x -> compression

So:

U = (53•0.21²)/2

U = 1.17

Answer1.17:

Explanation:

Answer: P=30W

Explanation:

formula is p=w/t

p = power

w = work

t = elapsed time

input variables, solve then simplify.

The power of a lift that transfers 450 J of energy in 15 seconds is 30 watts.

Power is defined as the rate of doing work, i.e. the amount of work done per unit time.

Mathematically, it can be represented as follows:

Power = Work done / time taken

Therefore, the power of a lift that transfers 450 J of energy in 15 seconds can be calculated as follows:

Power = Work done / time taken= 450 J / 15 s= 30 W

Therefore, the power of the lift is 30 watts.

To explain further, we know that power is measured in watts (W), and it is the rate at which work is done or energy is transferred.

Here, we are given that the lift transfers 450 J of energy in 15 seconds.

We can find the power of the lift by dividing the amount of work done by the time taken to do it. By substituting the given values, we get the power of the lift as 30 W.

In simple terms, this means that the lift can transfer energy at a rate of 30 joules per second. This can also be interpreted as the lift can do 30 joules of work in one second.

Hence, we can conclude that the power of the lift is 30 watts.

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24 volts is the voltage drop across each of the resistors in the parallel configuration.

When resistors are connected in parallel, they share the same voltage across them. Therefore, the voltage drop across each resistor in this scenario would be the same.

Given:

Power supply voltage (V) = 12 V

Resistance of each resistor (R) = 30 Ω

Since the resistors are in parallel, the total resistance (R_total) can be calculated using the formula:

1/R_total = 1/R1 + 1/R2

Substituting the values:

1/R_total = 1/30 Ω + 1/30 Ω

1/R_total = 2/30 Ω

R_total = 15 Ω

Now, we can find the current flowing through the resistors (I) using Ohm's Law:

I = V / R_total

I = 12 V / 15 Ω

I = 0.8 A

Since the voltage drop across each resistor is the same, we can find it using Ohm's Law:

V_drop = I * R

V_drop = 0.8 A * 30 Ω

V_drop = 24 V

Therefore, the voltage drop across each of the resistors in the parallel configuration is 24 volts.

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Answer:

2.12m/s

Explanation:

Given parameters:

Force on trolley  = 1.5N

Mass of trolley  = 0.2kg

Unknown:

Velocity of the trolley  = ?

Solution:

To solve this problem, we first find the acceleration of the trolley;

          Force  = mass x acceleration

         Acceleration  = \(\frac{Force }{mass}\)

Insert the parameters and solve;

          Acceleration  = \(\frac{1.5}{0.2}\)   = 7.5m/s²

Now to find the acceleration;

  Initial velocity  = 0m/s

  v² = u² + 2aS

v is the final velocity

u is the initial velocity

a is the acceleration

S is the distance

  Distance  = 30cm and this is 0.3m

     v² = 0² + 2(7.5)0.3  = 4.5

     v = √4.5 = 2.12m/s

Stone travels at the distance of 44.1 meters far did the stone drop before hitting water.

What is the distance ?

Distance is a numerical and sometimes qualitative measure of how far apart an object or point is. In physics or everyday use, distance can refer to estimates based on physical length or other criteria.

How can distance used in real life?

I am using it in my navigation. Airplane pilots use distance formulas to calculate the distance between their plane and other planes. Find the coordinates of the plane and then apply the distance formula to get the distance.

What is the use of distance?

(i) indicate body position at any point in time; (ii) You can see a graph of the distance your body has moved in a certain period of time. (iii) The object's velocity can be determined at any point in time.

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Answer:

jjjjjjjjjjjjjjjj

Explanation:

Answer:

960.4

Explanation:

98x9.8=960.4

Answer:

A mutation causes a dog to be born with a tail that is shorter than normal. Which best describes this mutation? It is harmful because it obviously affects the dog’s survival. It is harmful because it affects the dog’s physical appearance. It is neutral because it does not obviously affect the dog’s survival. It is beneficial because it affects the dog’s physical appearance.

Explanation:

Answer:

C

Explanation:

:)))

Answer:

The correct difference between chronic and acute stress is:

Acute stress is short-term, while chronic stress endures over time.

Explanation:

Acute stress refers to the immediate and temporary response of the body to a specific stressful event or situation. It is often characterized by a rapid increase in heart rate, heightened alertness, and the release of stress hormones like adrenaline. Acute stress is a normal and natural response to perceived threats or challenges, and once the stressor is removed or resolved, the body returns to its normal state.

On the other hand, chronic stress is long-term and persists over an extended period. It is typically caused by ongoing or recurring stressors, such as work pressures, financial difficulties, relationship problems, or chronic health conditions. Chronic stress can have a cumulative and prolonged impact on physical and mental well-being. It may lead to a range of health issues, including cardiovascular problems, weakened immune system, digestive disorders, anxiety, depression, and burnout.

Chronic stress is considered detrimental to overall health, while acute stress, when experienced in moderation, can actually be beneficial as it can enhance performance and help individuals deal with immediate challenges. It is important to manage chronic stress effectively through stress-reducing techniques, self-care practices, and seeking support when needed to prevent its negative consequences on health and well-being.

Explanation:

C is correct.

Newton second law states that force is directly proportional to acceleration with m being the constant of variation.

\(f _{net} = m(a)\)

So

\(250 = 50(a)\)

\(a = 5\)

A is wrong, the constant g only happens in free fall or in vertical direction

B and D are wrong due to the mathematical error or equation error

Answer:

Temperature

Explanation:

Commonly when speaking about the temperature outside we will refer to it as --degrees Fahrenheit or Celsius. So if I were to tell my friend that it is currently 68 degrees outside, that would mean that the current temperature is 68 degrees Fahrenheit or Celsius outside.

-Hope this helped

The impulse on the mass is equal to the area under the force -time graph. The area under the plot in the graph is 6 N.s thus the impulse is 6 Ns.

Impulse of a moving object is its change in momentum. It is equal to the product of force and time. The force- time plot of a moving object can be used to determine the impulse.

From the given force- time graph, the area  under the curve is :

area = area of the two triangles + area of the rectangle.

area of the triangle  = 1/2 (2 N × 2s )= 2N s

area of the rectangle = 2 N × 1s = 2N s.

The second triangle have the area equal to the first one that is 2 N s.

then the total area of the curve = 2 Ns × 3 = 6 Ns.

Therefore, the impulse on the mass is 6 Ns.

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Answer:

gravity

Explanation:

Explanation:

m = 4kg

u = 20m/s

t = 10s

v = 60m/s

initial momentum = mass × initial velocity

= 4 × 20 = 80kgm/s

The gravitational force on planet X is one-eight (¹/₈) of the magnitude of gravitational force on planet Y.

The gravitational force on each planet is directly proportional to the product of mass of the planet and the tennis ball and inversely proportional to the square of the radius of the planets.

F = GmM/r²

where;

The gravitational force on planet X is written as;

F_X = Gm(mt) / r²

where;

The gravitational force on planet Y is written as;

F_y = G(½m)(mt) / (¼r)²

F_y = ½(Gm(mt) / (¹/₁₆ r²)

F_y = (16 Gm mt)/(2r²)

F_y = 8(G m(mt) ) / r²

F_y = 8(F_X)

F_X = ¹/₈(F_Y)

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Answer:

b 1.3

Explanation:

The length of the lane is 27.66 m and the velocity of the bowling ball just before it hits the pins is 10.12 m/s.

The three equations of motion are -

v = u + at

S = ut + 1/2at²

v² - u² = 2aS

Given is a bowling ball that rolls down the lane with a velocity of 12 m/s. After that, the ball slows down at a constant rate of 0.75 m/s².

[u] = 12 m/s

[a] = 0.75 m/s²

Part A

time taken to reach the pins = [t] = 2.5 s

S = ut + 1/2at²

S = 12 x 2.5 + 1/2 x - 0.75 x 2.5 x 2.5

S = 12 x 2.5 - 2.34

S = 30 - 2.34

S = 27.66 m

Part B

Assume that the velocity is v m/s.

v² = u² + 2aS

v² = (12)² - 2 x 0.75 x 27.66

v² = 144 - 41.49

v² = 102.51

v = 10.12 m/s

Therefore, the length of the lane is 27.66 m and the velocity of the bowling ball just before it hits the pins is 10.12 m/s.

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Answer: shrimp harvest were better farther away from the shore as fish migrated out to sea because runoff caused a change in salinity in the sound.

Explanation: i just took the test this is the correct answer

Answer:

-67.24 m/s²

Explanation:

From the given information:

Using the formula for Kinematic equation i,e \(v_y^2 -v_{0y}^2=2a_yd\) to find the speed with which the pole-vaulter approaches the pad

where;

\(v_y =\) the speed when the individual approaches the pad = ???

\(v_{oy}=\) initial speed at the location of the bar = 0

\(a_y =\) the individual acceleration which is also equivalent to acceleration due to gravity. = 9.8 m/s²

d = distance travelled

Thus;

d = 4.2m - 80 cm

d = 4.2 m - 0.8 m

d = 3.4 m

\(v_y^2 -(0)^2=2\times 9.8 \ m/s^2 \times 3.4 \ m\)

\(v_y^2 =2\times 9.8 \ m/s^2 \times 3.4 \ m \\ \\ v_y ^2 = 66.64 \ m/s \\ \\ v_y = \sqrt{66.64 \ m/s} \\ \\ v_y = 8.2 \ m/s\)

Thus, the initial speed of the pole-vaulter at the top of the pad = 8.2 m/s

Using the same above equation to determine the acceleration as the pole-vaulter approaches rest on the pad:

i.e

\(v_f^2 -v_{0}^2=2a_yd'\)

\(0^2 -(-8.2\ m/s)^2=2a(0.5 \ m) \\ \\ a = - \dfrac{(8.2 \ m/s)^2}{2(0.5 \ m) } \\ \\ \mathbf{a = -67.24 \ m/s^2}\)

Answer:

spring 1 has less potential energy

Explanation:

since spring 2 is clampped down further it will have a greater effect but since sping 1 is barely clamped down it wont show as much energy

Explanation:

I have only 4 of them ,hope they help

Answer:

A systematic error may result in a high degree of precision.

A systematic error will likely result in poor accuracy

Explanation:

It's what my work gave me when I got it wrong

The volume of the ark is 11163 cubic feet.

The term volume of a box refers to the product of the length, width and height of the box. We have been told that the ark of Noah could be likened to a box and we have been asked to obtain its volume.

Hence;

width = 3.5  * 50 = 175 inches or 14.58 feet

length = 300 * 3.5 = 1050 inches or 87.5 feet

height = 30  * 3.5 = 105 inches or 8.75 feet

Volume of the ark = 14.58 feet * 87.5 feet *  8.75 feet

Volume of the ark = 11163 cubic feet

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