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Q. A 78 kg circus performer jumps from a 4.2 m height onto a trampoline and stretches it downward 0.30 m. Assume that the trampoline obeys Hooke's law.
(a) How far will it stretch if the performer jumps from a height of 8.3 m?
(b) How far will the trampoline stretch if the performer stands still on it while taking a bow?
Q. Identify the action-reaction pairs when a baseball is being hit.
(a) ball hits a bat, bat hits the player(b) ball hits bat, bat pushes the arm of the player(c) bat hits ball, ball hits bat(d) bat hits ball, ball hits the player(e) none of these
A magnetic field near the ceiling points up and is decreasing. Looking up at the ceiling, does non-Coulomb electric field curl clockwise or counter-clockwise.
A 70.0 kg circus performer slides 4.90m down a pole to the circus floor, starting from rest. What is the kinetic energy of the performer as she reaches the floor if the frictional force on her from the pole (a) is negligible (she will be hurt) and (b..
How to find out an initial speed of the bullet
A uniform electric field with a magnitude of 250N/C is directed in the positive x direction. A 12uC charge moves from the origin to the point (20.0 cm, 50.0 cm). what is the change in electrical potential energy of the system as a result of the ch..
When a second pipe is played at the same time, a 1.40 Hz beat note is heard. By how much is the second pipe too long.
At one instant a bicyclist is 50 m due east of a park's flagpole, going due south with a speed of 9 m/s. Then, 24 s later, the cyclist is 45 m due north of the flagpole, going due east with a speed of 20 m/s. For the cyclist in this 24 s interval,..
What is coefficient of kinetic friction
As part of a safety investigation, two 1900 cars traveling at 25 are crashed into different barriers. Find out the average forces exerted on (a) car that hits a line of water barrels and takes 1.8 to stop, and (b) car that hits a concrete barrier an..
Discover the magnetic field on the z axis What happens if the block is immersed in carbon disulfide
A body travels a distance of 3km towards east and 4 km towards north and finally 9 km towards east. what is the total distance travelled and displacement of body.
A .228g wires are stretched between two points 77.20 cm apart. The tension in the wire is 618N. Find the frequency of the first harmonic. Reply in units of Hz.
A force vector has a magnitude of 569 newtons and points at an angle 41o of below the positive x axis. What is (a) x scalar component and (b) y scalar component of the vector.
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