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1. A 7.80-g bullet moving at 575 m/s strikes the hand of a superhero, causing the hand to move 5.50 cm in the direction of the bullet's velocity before stopping. (a) Use work and energy considerations to find the average force that stops the bullet. (b) Assuming the force is constant, determine how much time elapses between the moment the bullet strikes the hand and the moment it stops moving.
2. A 400-N child is in a swing that is attached to a pair of ropes 2.00 m long. Find the gravitational potential energy of the child-Earth system relative to the child's lowest position when (a) the ropes are horizontal, (b) the ropes make a 30.0° angle with the vertical, and (c) the child is at the bottom of the circular arc.
3. The potential energy of a system of two particles separated by a distance r is given by U(r) = A/r, where A is a constant. Find the radial force rightwards arrow above F sub r that each particle exerts on the other.
a water tower 30 m tall is located at the top of a hill. from a distance of d 125 m down the hill it is observed that
A small but measurable current of 1.6 10-10A exists in a copper wire whose diameter is 3.1 mm. suppose the current is uniform. Compute the current density. Compute the electron drift speed.
A 4.38-kN piano is lifted by three workers at a constant speed to an apartment 27.2 m above the street using a pulley system fastened to the roof of the building. find the time required to lift the piano from the street to the apartment
a cat rides a merry-go-round while turning with uniform circular motion. at time t1 2.00 s the cats velocity is v1
Visible light passes through a diffraction grating that has 900 slits per centimetre, and the interference pattern is observed on a screen that is 2.58m from the grating. In the first-order spectrum, maxima for two dissimilar wavelengths are separate..
A potter's wheel, with rotational inertia 6.50 , is spinning freely at 16.0 . What is the subsequent angular speed of the wheel
A car is going with a constant speed of 15 m/s (about 34 mph) in a school-crossing corner, where the speed limit is 10 m/s (about 22 mph). What is the speed of the police car at that point
a water-skier is being pulled by a tow rope attached to a boat. as the driver pushes the throttle forward the skier
Find the magnitude of the net force on arigid square loop of wire of side length l =6.36 cm. The center of the loop is 10.10 cm from the wire and theloop carries a current of 10.0 A.
A 61.0 kg bungee jumper, tied to a 37.0 m long cord, leaps off a bridge whose deck is 67.0 m above the water. He falls to 8.0 m above the water before the bungee cord pulls him back up. What is the magnitude of the impulse exerted on the bungee jumpe..
The resistive-wire thermometer is then calibrated against a Hg thermometer. The resistance in terms of the temperature t on the Celsius scale can be optimally fitted by the expression R = R0(1 + alpha t + beta t2) where alpha = 3.80 Times 10-3 degree..
A 10.0 uF parallel-plate capacitor is connected to a 12.0 -V battery. What would the voltmeter read
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