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A 80 kg skydiver can be modeled as a rectangular "box" with dimensions 23 cm×45cm×1.8m. What is his terminal speed if he falls feet first? Suppose that the density of air is 1.2 kg/m^3?
A car misses a turn and sinks into a shallow lake to adepth of 14.4 m. If the area of the car door is 0.40 m2, what is the force exerted on the outside of the door by the water?
You drop a rock from rest from the top of a tall building. It takes 0.117 s for the rock to pass by a 2.10-m high window. How far from the top of the building is the top of the window? (Express your answer to three significant figures.)
Two parallel plates of area 81 cm.^2 have equal but opposite charges of 3.20E-07 C. Within the dielectric material filling the space between the plates, the electric field is 2.70E+05 V./m. Find the dielectric constant of the material.
a particle of mass m0 is given a kinetic energy equal to one-fourth its rest-mass energy. how fast must the particle be
Assume a simple "idealized" case where the average gas pressure acting on the piston during the compression stroke is 1 MPa, and pressure during the intake stroke is negligible. The compressor is 80% efficient. A flywheel provides adequate control..
What is the fraction of the hydrogen atom's mass (11H) that is in the nucleus? The mass of proton is 1.007276 u, and the mass of 11H atom is 1.007825 u.
An alpha particle with a kinetic energy of 6.00MeV makes a head-on collision with a gold nucleus at rest. What is the distance of closest approach of the two particles
(a) What must the initial speed of the ball be if the pitch is to arrive at the batter exactly 1.00 m above the ground? (b) How long does it take the ball to reach the batter? (c) If there were no gravity, at what angle would the pitch have to be ..
a hospital patient has been given 131i half life 8.04 days which decays at 4.5 times the acceptable level for exposure
A sinusoidal electromagnetic wave from a radio station passes perpendicularly through an open window that has area of 0.500m2. How much energy does this wave carry through the window
A total of 55 J of work is needed to stretch a spring from x = 0.40m to x = 2.7m , in which x is displacement from equilibrium. What is the value of the spring constant?
You want to construct an RC circuit with RC time constant of 15 s. You have available capacitor of 20 µF. What resistance do you need?
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