Three observers watch a train pull away from a station toward the right of the platform. observer a is in one of the train’s cars; observer b is on the station platform; and observer c is on another train traveling in the opposite direction along a parallel track. how would the observer in each frame of reference describe the motion of the train? according to newton’s laws of motion, how would the motion in the station platform’s frame of reference change if the conductor applied the brakes to the train? does universal gravitation affect the train? explain why or why not.
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Name three different units of energy used to measure heat and describe what type of situations each is usually used.
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Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?
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Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?
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Three observers watch a train pull away from a station toward the right of the platform. observer a...
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