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Compute the change in potential energy of a 82.8-kg man when he takes an elevator from the first floor to 26th floor, if the distance among floors is 4.05 m.
(Hint: Utilize the equation for the change in gravitational potential energy in a uniform gravity field. (Involve mass, acceleration due to gravity, and height)
The source of a sound wave has a power of 8.34μW. If it is a point source, (a) what is the intensity and (b) the sound level at 2.29 m. distance?
the second order maximum produced by a diffraction grating with 560 lines per centimeter is at an angle of 3.1 degrees.
a positron q e moves at 4.88 x 107 ms in a magnetic field of magnitude 0.410 t. the magnetic force on the positron has
An electron traveling at 15 m/s enter a 2.1 T magnetic field. The angle between the velocity and the field is 100 degree. Estimate the radius of the resulting circular path
the headlights of a pickup truck are 1.32 m apart.a. what is the greatest distance at which these headlights can be
A quarterback throws a pass that is a perfect spiral. In other words, the football does not wobble, but spins smoothly about an exis passing through eaach end of the ball. how many revolutions has the ball made while in the air
The isotope 88224Ra of radium has a decay constant of 1.19×10-6 per second. What is the half-life (in days) of this isotope
A parallel-plate air capacitor of area A = 20.9 cm2 and plate separation of d = 2.50 mm is charged by a battery to a voltage of 63.0 V, What is the charge on the capacitor
Ball 1, with a mass of 140 g and traveling at 12.0 m/s, collides head on with ball 2, which has a mass of 300 g and is initially at rest. What are the final velocities of each ball if the collision is perfectly elastic
a car starts from rest at a stop sign. it accelerates at 2.0 ms2 for 6.0 seconds coasts for 2.0 s and then slows down
a tennis player places a 50 kg ball machine on a frictionless surface. what is the final velocity of the machine
In Chapter 10 in the textbook, we saw that the Achilles tendon will stretch and then rebound, storing and returning energy during a step. What is the spring constant of her Achilles tendon
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