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A thin rod of length L and negligible mass can pivot about oneend to rotate in a vertical circle. A heavy ball of mass m isattached to the other end. The rod is pulled aside through anangle A and released. As the ball descends to its lowestpoint,
a.) how much work does its weight do on it and
b.) what is the change in the gravitational potential energyof the ball-Earth system?
c.) If the gravitational potential energy is taken to be zeroat the lowest point, what is its value just as the ball isreleased?
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water
It is desired to build a heat pump that has an output temperature of 31 °C. Calculate the maximum coefficient of performance for the pump when the input source is ground water at 8.1 °C
what is the maximum speed the ball can have. imagine there are no other forces acting on the particle.
A disk of radius R and mass M = 10 g is rotating freely about a fixed axis through its center with angular velocity w = 11 rad/s. A spider of mass m = 0.5 g descends onto the disk and goes along for the ride. The moment of inertia of the disk is I..
The heating element of a simple heater consists of a 2.2-m-long, 0.65-mm-diameter nichrome wire. calculate the resistivity of nichrome in this situation
The rope is inclined at 20.30° above the horizontal, and the sledge moves a distance of 20.3 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500.
Over a time interval of 2.17 years, the velocity of a planet orbiting a distant star reverses direction, changing from +17.9 km/s to -18.0 km/s. find the total change in the planet's velocity
q1. a merry-go-round rotates at the rate of 0.30 revs with an 80 kg man standing at the point 2.0 m from the axis of
A rectangular loop is 1.2 m wide and 0.80 m tall and carries 0.50 A of current clockwise. Find the net force and torque on the rectangular loop
A man claims that he can hold onto a 16.0-kg child in a head-on collision as long as he has his seat belt on. Find the magnitude of the average force needed to hold onto the child
If the elevator's descending speed is measured at 10 m/s at a given point, but its speed is decreasing by 2.7 m/s2, what is a force exerted by the scale.
The pilot of the spaceship measures the length of the moving ship as 30 meters. Establish its length as measured by a person on earth.
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