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Q1. A 45.4 kg girl is standing on a 144 kg plank. The plank, at first at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.60 m/s relative to the plank. What is her velocity relative to the surface of ice? What is velocity of the plank relative to the surface of ice?
Q2. A CD player uses a laser whose light frequency is 3.85 × 10^14 Hz. compute the energy (in joules) of photons?
What is the maximum speed with which a 1200- car can round a turn of radius 71 on a flat road if coefficient of static friction between tires and road is 0.45.
Discover the tensions in the rope
What direction is white dot on the sensor pointing
A 65Kg ice skater pushes off his partner and accelerates backwards at 1.3m/s^2. If the partner accelerates in the opposite direction at 2.0m/s^2, what is mass of the other skater.
The car's motion can be divided into three different stages: its motion before the driver realizes he's late, its motion after the driver hits the gas (but before he sees the police car), and its motion after the driver sees the police car. Which of ..
If the velocity of the car is increased to 50 km/ hour, what is its kinetic energy. if the velocity is improved to 75 km/ hour, what is its kinetic energy.
What is the change in kinetic energy of the puck
The first electron has the initial velocity v0 that makes an angle θ=45° with the lower plate and has a magnitude of 7.53×106 m/s. would this electron strike one of the plates? If so, what is the horizontal distance from the left edge? If not enter t..
Determine the greatest vertical displacement of the pendulum
Consider a large parallel plate capacitor with circular plates of radius R. suppose that the electric field between the plates is increasing.
What average force athletes legs apply on a ground
Find out an average acceleration of the motorcycle
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