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Question: A rock is tossed straight up with a velocity of 20 m/s When it returns, it falls into a hole 10m deep.
Part I: What is the rock's velocity as it hits the bottom of the hole?
I need help to find the rock's velocity as it hits the bottom of the hole.
A horizontal force of magnitude 41.5 N pushes a block of mass 4.23 kg across a floor where the coefficient of kinetic friction is 0.571. What is the increase in the kinetic energy of the block
a 2 kg rock tied to a 3 meter long rope is spun around in a horizontal circle at 4 ms. how much work is done on the
Blue laser pointers are now available. If the blue laser emits 5 mW of light at 473 nm, how many photons per second is it emitting
A solid wooden ball is rotating about an axis passing through its center. If its angular speed if doubled, find by what factor does its rotational kinetic energy change
A hydraulic lift has pistons with areas 0.40m2 and 5.95m2 , and they're at the same height. how much mass can the larger piston support
implies a serious limit to such detection. (Note also that the uncertainty is greater if there is an uncertainty in the propagation speeds of the S- and P-waves).
a positron emission tomography scanner examines the gamma rays emitted when positrons and electrons annihilate each other. What is the wavelenth of the photons
The world's strongest magnet that can produce a sustained field is a 45-T device at the National High Magnetic Field Laboratory in Florida. What's the corresponding magnetic-energy density
A sheet of an unknown material that is 1.223 +/-.003 micrometers thick is suspended in air. What is the index of refraction of the material
The light shining on a diffraction grating has a wavelength of 520 nm (in vacuum). How many lines per centimeter does the grating have
A satellite is in a circular orbit about the earth (ME = 5.98 x 1024 kg). The period of the satellite is 2.11 x 104 s. What is the speed at which the satellite travels
The 2.0 kg, 20 cm diameter disk is spinning at 320 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 2.0 s.
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