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A wheel spins on its axis with a angular velocity of 2 rad/s. A torque is applied to speed to wheel up, and this torque produces an angular acceleration of 3 rad/s2. Find how long will it take to get the angular velocity up to 8 rad/s?
An electron and a proton attract each other with a 1/ r2 electric force, just like the gravitational force. Find what is the radius of the orbit
This time, william tell is shooting at an apple that hangs on a tree. the apple is a horizontal distance of 20.0m away and at a height of 4.00m above the ground. what is the arrow's inital velocity
a meteor whose mass was about 1.4times108kg struck the earth mass of earth 6.0 x 1024 kg with a speed of about 18kms
two carpenters are hammering at the same time each at a different hammering frequency. the hammering frequency is the
A photon of wavelength 0.14795 nm, traveling due east, is scattered by an electron initially at rest. What is the velocity of the scattered electron
A test of the prototype of a new automobile shows that the minimum distance for a con- trolled stop from 92 km/h to zero is 54 m. How much time does the car take to stop
A wheel free to rotate about its axis that is not frictionless is initially at rest. A constant external torque of +53 N·m is applied to the wheel for 22 s, giving the wheel an angular velocity of +610 rev/min. The external torque is then removed,..
When catching a baseball, a catcher's glove moves by 12 cm along the line of motion of the ball. how much work is done by the ball
A potter's wheel having a radius 0.49 m and a moment of inertia 10.9 kg·m2 is rotating freely at 52 rev/min. Find the effective coefficient of kinetic friction between the wheel and the wet rag
A flat curve on a highway has a radius of 290 meter. A car rounds the curve at a speed of 22.0 m/s. Find the minimum coefficient of friction that will prevent sliding
A 100 W beam of light is shone onto a black body of mass 2 x 10^-3 kilogram for a duration of 10^4 s. The black body is initially at rest in a frictionless space. Obtain the final kinetic energy of the black body
Assume that a 6 volt energy source is in a circuit that has a resistance of 10ohms. Determine the current and power
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