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A 7.80-g bullet moving at 650 m/s penetrates a tree trunk to a depth of 5.4 cm.
(a) Use work and energy considerations to find the average frictional force that stops the bullet.
N
(b) Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.
An airplane propeller is rotating at 1250rpm. Compute the propeller's angular velocity
A pair of hedge trimmers are 45 cm long from the pivot to the end of the handles. If the person applies of a force of 15 N on each handle, how much force is applied to the branch
A gun is fired vertically into a m = 1.44 kg block of wood at rest on a thin horizontal sheet directly above it. How high from the sheet will the block rise into the air
Hooke's Law states that the force needed to stretch a spring is proportional to the amount the spring is stretched. If 10.0 N of force stretches a spring 4.00cm
A student ate a Thanksgiving dinner that totaled 3000Cal . He wants to use up all that energy by lifting a 30-kg mass a distance of 1.0 m. How many times must he lift the mass
a 10.0kg, 16.0m long, uniform beam is supported by two scales. A 40.0kg box is placed on the beam. what are the scale readings
two point charges, seperated by 1.5 cm have charge values of +2.0, What is the value of the mutual force between them
what is the new force between the objects. if Andromeda contains roughly the same number of stars and attracts the Milky Way with a gravitational force of 2.4*10^30N.
Two point charges, q1 = -12.5 ?C and and q2 = +18.7 ?C, are placed at two of the corners of a right triangle with a = 23.5 cm, Find the magnitude of the electric field at the third corner of the triangle
An irregularly shaped piece of metal has a weight of 8.840 N. It is suspended from a scale, which reads 7.320 N when the piece is submerged in water
A car travels along a U-shaped curve for a distance of 400 m in 30 s. What is the magnitude of the average velocity
A 196.2 kg satellite is in a circular orbit of 26,273 miles (42,300,000 m) in radius. The force keeping the satellite in orbit is 42.1 N
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