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A car with a mass 900kg and velocity 12m/s traveling north isapproaching an intersection. another car with a mass 750kg and avelocity of 9m/s traveling west is approaching the sameintersection. They collide and stick together and head off in some direction north or west. What is the loss in kinetic energy due to the collision?
A plastic plano-concave lens has a radius of curvature of 50 cm for its concave surface. what is the power of the lens
Two objects attract each other gravitationally with a force of 2.3×10-10 when they are 0.65 apart. Their total mass is 5.0 . Find out their individual masses.
In this problem, the question tells us that there are two springs connected to each other, and that the spring constant of each of them is 6430 N/m. Can someone explain why the total effective spring constant of the 2 springs is k/2 and not just 6430..
A wheel starts from rest and rotates about its axis with constant angular acceleration. What is the angular velocity when the time t = 6.7 s
One end of a wire is attached to a ceiling, and a solid brass ball is tied to the lower end. What is the radius of the brass ball
A balloon is filled with 4.75 liters of helium at a pressure of 1.05 atm and a temperature of 28.0° C. Find the acceleration of the balloon if the rubber has a mass of 4.00 g
A gas undergoes two processes. In the first, the volume remains constant at 0.200 m3 and the pressure increases from 2.00 105 Pa to 5.10 105 Pa. Find the total work done by the gas during both processes
A toy cannon uses a spring to project a 5.23 g soft rubber ball. The spring is originally compressed by 4.90 cm and has a force constant of 8.04 N/m. At what point does the ball have maximum speed
Two Styrofoam balls with the same mass m = 9.5 10-8 kg and the same positive charge Q are suspended from the same point by insulating threads of length L = 0.98 m (the figure below). The separation of the balls is d = 0.026 m. What is the charge Q?
A place kicker should kick a football from a point 32 m (about 35.0 yd) from the goal, and the ball should clear the crossbar, which is 3.050 m high. When kicked, the ball leaves the ground with a speed of 21.0 m/s at an angle of 49° to the horizo..
Suppose you hear a clap of thunder 15.80 s after seeing the associated lightning stroke. The speed of sound waves in air is 343-m/s, and the speed of light in air is 3.00x 10^8 m/s.
A student (m = 56 kg) falls freely from rest and strikes the ground. All through the impact with the ground, he comes to rest in a time of 0.04 s.
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