Master Physics with Fun Quizzes & Brain Teasers!

what is the minimum primary current just to operate the relays
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for most gases, increasing the pressure from 1.0 atm, will cause the compressibility factor (z) to:
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What are the magnitude and direction of the torque about the origin on a plum located at coordinates (-4 m,0 m, 4 m) due to force F whose only component is Fx = 7 N?
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If, on a cold morning you find your car battery is dead, why can't you just use a string of 1.5 volt AA batteries to start your car?
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A Doppler weather radar station broadcasts a pulse of radio waves at frequency 2.85 GHz. From a relatively small batch of raindrops at bearing 38.6 east of north, the station receives a reflected pulse after 180 s with a frequency shifted upward by 254 Hz. From a similar batch of raindrops at bearing 39.6 east of north, the station receives a reflected pulse after the same time delay, with a frequency shifted downward by 254 Hz. These pulses have the highest and lowest frequencies the station receives. (a) Calculate the radial velocity components of both batches of raindrops. (b) Assume that these raindrops are swirling in a uniformly rotating vortex. Find the angular speed of their rotation.
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match each of the following descriptions with the most appropriate ignitable waste category. group of answer choices is flammable when 14% is mixed with air at 50 p.s.i. [ choose ] has a flash point at 150 degrees f. [ choose ] 70% hydrogen peroxide [ choose ] metal grinding waste [ choose ]
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Which of the following describes why water has a concave, or downward-curving meniscus when poured in a glass beaker? Water has a higher density than giass, The achesive forces with the glass are greater than the cohesive forces: The cohesive forces with the glass are greater than the adhesive forces: Glass has a higher density than water
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A 4.00kg block is set into motion up an inclined plane with an initial speed of vi = 8.60 m/s (see figure below). The block comes to rest after traveling d = 3.00 m along the plane, which is inclined at an angle of theta = 30.0 to the horizontal.An inclined plane makes an angle of theta with the horizontal. A block is shown on the plane at two different positions, a distance d apart. An arrow labeled vi is above the lower position of the block, and points up and to the right, parallel to the plane.(a) For this motion, determine the change in the block's kinetic energy.(b) For this motion, determine the change in potential energy of the blockEarth system.(c) Determine the friction force exerted on the block (assumed to be constant).(d) What is the coefficient of kinetic friction?
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a car weighing 12,950 n starts from rest and accelerates to 83.0 km/h in 4 s. the friction force is 1,430-n. find the applied force produced by the engine.
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one end of a cylindrical pipe has a radius of 3.0 cm. water streams steadily out at 6.8 m/s. what is the rate at which mass is leaving the pipe? answer in kg/s.
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a 95-kg man pushes a crate 4.5 m up along a ramp that makes an angle of 17 with the horizontal. he exerts a force of 520 n on the crate parallel to the ramp and moves it at a constant speed. calculate the work done by man ?
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what is the boiling point of 0.600 m lactose in water? (kb for water is 0.512c/m)
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what is the energy of a photon of electromagnetic radiation with a frequency of 73231548 hz? put your answer in units of joules. please use scientific notation so that 1 x 10-10 is written as 1e-10.
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if 1.50 g of a reacts with 1.65 g of b , what is the mass of c ?
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a carnot heat engine with thermal efficiency 1/6 is run backward as a carnot refrigerator.what is the refrigator's coefficient of performance?
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Water from a fire hose is directed horizontally against a wall at a rate of 44.1 kg/s and a speed of 46.5 m/s. Calculate the magnitude of the force exerted on the wall, assuming the water's horizontal momentum is reduced to zero.
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A baseball is hit almost straight up into the air with a speed of about 20 m/s. a.) How high does it go? b.) How long is it in the air?
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A 0.200 H inductor is connected in series with a 96.0 resistor and an ac source. The voltage across the inductor is vL=(12.5V)sin[(483rad/s)t] Part A Derive an expression for the voltage vR across the resistor. Express your answer in terms of the variables L, R, VL (amplitude of the voltage across the inductor), , and t Part B What is vR at 2.15 ms ?
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Suppose that a particle moves along a straight line with a velocity v(t) = 4 - 2t, where t is in the interval [0, 4]. Find the displacement of the particle up to t =4 and the total distance traveled up to t = 4. Total displacement = Total distance =
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at graduation, you toss your mortarboard cap straight up at some initial speed v. If air resistance is ignored, how fast is the cap moving when it comes back down to your hands?at speed more than v at speed less than v at speed v
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how do you need to move your arm to make a large amplitude wave
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The magnitude of electric field 35cm from a point charge Q is 680N/C due to that charge. What is the magnitude of the charge Q? a) 9.6*10^-11 C b) 4.99*10^13 C c) 8.57*10^-17 C d) 9.26*10^-9 C e) 9.26*10^-5C
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two solenoids are made with the same cross sectional area and total number of turns. inductor b is twice as long as inductor a;
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Calculate the kinetic energy in J of an electron moving at 6.00 x 106 m/s. The mass of an electron is 9.11 x 10-28 g. A) 4.98 x 10-48) B) 3.28 x 10-14) C) 1.64 x 10-17) D) 2.49 x 10-48J E) 6.56 x 10-14)
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