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a thin rod, of length L = 0.80 m and negligible mass that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m = 9.0 kg is attached to the other end. The rod is pulled aside through an angle ? = 36.0° and released.
a. As the ball descends to its lowest point, how much work does its weight do on it?
b. As the ball descends to its lowest point, what is the change in the gravitational potential energy of the ball-Earth system?
c. If the gravitational potential energy is taken to be zero at the lowest point, what is its value just as the ball is released?
Find the radius of the largest water drop
A 40 kg child slides down a playground slide at a constant speed. The slide has a height of 3.6 m and is 7.6 m long. find the magnitude of the kinetic friction force acting on the child
Assume that the cell is floating on the surface of water, and that the water surface has a coefficient of friction of u=0.300. You now want to use a laser to move cell horizontally, along the surface of the water.
A lightbulb operates at a power of 60 watts when connected to a potential difference of 120 volts. In this condition, how many electrons are passing though it per second
Two bodies of masses 20.1 kg and 14.6 kg move along the x-axis in opposite directions with velocities of 12.2 m/s -- positive x-direction and 10.9 m/s -- negative x-direction, respectively
A planet's moon travels in an approximately circular orbit of radius 5.4 107 m with a period of 7 h 21 min. Calculate the mass of the planet from this information
You would like to balance a meter stick on your finger. The meter stick has a mass of m = 0.2 kg. (a) How far from the end should you place your finger to balance the stick? (b) Suppose two additional masses of M = 0.1 kg are placed at the positions ..
A doubly charged helium atom whose mass is 6.6 *10^-27 is accelerated by a voltage of 3000 V. What is its period of revolution
An aluminum sphere of radius 10.7 cm is heated from 110.0 °F to 182.0 °F. (The linear expansion coefficient for aluminum is 2.20 10-5 K?1.), Find the radius change
A 50 kg projectile is fired over level land at an angle of 30 degrees above the horizontal with a muzzle velocity of 210 m/s. How much energy was released during the explosion
A charged particle is projected in a uniform electric field between two plates with initial velocity 5x10^3m/s at angle 40 degrees to the x-axis. Its charge is q= -1.0x10^-11 C and mass is m=3.0x10^-14 kg.
The mass of a gas molecule can be computed from its specific heat at constant volume, cv. Take cv = 0.023 cal/g°C for xenon and calculate the mass of a xenon atom. (kg)
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