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A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 95.0 kg. The mass of the rock is 0.300kg. Initially the wagon is rolling forward at a speed of 16.0m/s. Both speeds are relative to the ground. Find the speed of the wagon after the rock is thrown directly forward in one case and directly backward in another.
A helicopter lifts a 81 kgastronaut 20 m vertically from theocean by means of a cable. The acceleration of the astronaut isg/10. What is the speed of the astronaut just before she reaches thehelicopter
A 55.0kg archer, standing on frictionless ice, shoots a 90.0g arrow at a speed of 50m/s. What is the recoil speed of the archer
A 4lb block and a 13lb block, connected by a string slide down a 30 degree inclined plane. The coefficient of kinetic friction between the first block mentioned is 0.10; between the second block and the plane it is 0.20. Find the tension(in pounds) i..
The locomotive is moving at 25 km/h. The engineer of the high speed train immediately applies the brakes. What must be the magnitude of the resulting constant deceleration if a collision is to be just avoided.
An engine takes in 8000 cal of heat and exhausts 4000 cal of heat each minute it is running. How much work does the engine perform each minute
An object is located 13.0 cm in front of a convex mirror, the image being 7.00 cm behind the mirror. How far in front of the mirror is the second object located
A monochromatic light source used in a diffraction experiment has a wavelength of 4.60 X 10^-7 m. What is the energy of a photon of this light
A container holds 2.0 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinematic energy of an 8.0 X 10^-3kg bullet with a speed of 770m/s
A plank 2.00 cm thick and 14.9 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m horizontally over the sea below. find the shear modulus of the wood
An electron of mass, m, collides with an atom of mass M. The atom is initially at rest, What is the minimum speed of the electron in order to excite the atom
An earth satellite moves in a circular orbit with an orbital speed of 6100 m/s. Find the time of one revolution of the satellite
Calculate the y-component of the magnetic force.
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