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1) Is it possible for the frictional force to increase the mechanical energy of a system?
2) How a car's airbag works in terms of momentum? AND in terms of energy?
3) A solid sphere, hoop, and disk (all with same mass and radius) are rolled up an incline with (potentially) different initial speeds. They each reach the same height up the incline. Compare the initial speed that they each enter the incline and explain the order. Why is one greater than another and/or why are they the same?
4) A ball rolls up a ramp which abruptly ends with the ramp dropping straight down. The ball launches off the end of the ramp while still traveling at an upward trajectory, goes through projectile motion, and returns to the same height as the base of the ramp. Ignoring any slowing friction (rolling friction), when the ball returns to the height of the ramp's base, the ball lands with a greater speed than when it entered the ramp.
You are traveling in a convertible with the top down. The car is moving at a constant velocity of 12.8 m/s, How far has the car moved when you get a chance to catch the tomato
List the four quantum numbers (n, l, m, s) for each possible electron state for a nucleus with n=3. How many possible states are there
You plan to fly a model airplane of mass 0.390 kg that is attached to a horizontal string. The plane will travel in a horizontal circle of radius 5.90 m. Find the speed at which you must fly the plane
A vertical solid-steel post 26.0 cm in diameter and 2.53 m long is required to support a load of 8200 kg. You may ignore the weight of the post. What is the strain in the post and the change in the posts' length when the load is applied?
q1. a .3kg baseball travelling at 48 ms approaches a waiting batter. when the ball is hit its back sailing away at 80
An air-filled toroidal solenoid has a mean radius of 14.6cm and a cross-sectional area of 4.95cm^2. What is the last number of turns that the winding must have
A spring has a period of 10 second, and a time constant of 30 s. Initially it has amplitude of 100 centimeter. Find how long before its amplitude is only 50 centimeter
Calculate the fluid force (in Newtons) on a square plate with aside of 6 m that is submerged at ahorizontal angle of 30°. Assume that the top edge of the platelies at a depth of 5 m in the water
An ideal spring is compressed 12 centimeter from the equilibrium length resulting in 72 Joule of potential energy being stored in the spring. Find what compression from the equilibrium length would be required
As part of a safety investigation, two 1700kg cars travelling at 25 m/s are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.3 seconds to stop, and (b) car that hits a concrete ..
three point charges have equal magnitudes two being positive and one negative. these charges are fixed to the corners
neutrons of 1.5 mev energy are introduced at the rate of 2x1015 neutronscm3sec into an infinite slab of graphite.
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