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A spy camera is said to be able to read the numbers on a car's license plate. If the numbers on the plate are 4 centimeter apart, and the spy satellite is at an altitude of 140 kilometer, Find what must be the diameter of the camera aperture? (Assume light with a wavelength of 510 nm).
A 0.14 kilometer wide river flows with a uniform speed of 4.0 m/s toward the east. Compute the speed of the boat relative to the water
To a first approximation, the Sun consists of a gas of equal numbers of protons and electrons. The temperature at the center of the Sun is about 10^7 K, Estimate the pressure at the center of the Sun
a piece of purple plastic is charged with 8.06106 extra electrons compared to its neutral state. what is its net
A 2.1 multiplied by 103-kg car starts from rest at the top of a 4.5-m-long driveway that is inclined at 16° with the horizontal. find the speed of the car at the bottom of the driveway
a uniform line charge extends from x - 2.7 cm to x 2.7 cm and has a linear charge density of 5.9 ncm.a find the
What is the average induced emf in the coil in mV. If he is crossing a river where the current is 1.60 km/h, in what direction should his boat be headed if he wants to reach the point directly opposite his starting point.
In a simple model of the hydrogen atom, theelectron revolves in a circular orbit around the proton with aspeed of 1.1 x 10 6 m/s. What is the radius of the electrons orbit
how many electrons n does it take to make a charge of -1.0 c? a current of 1.2 a passes through a wire for 1.3 minutes.
how many turns should a solenoid of cross-sectional area 0.035 m2 and length 0.39 m have if its inductance is to be 48
Two Earth satellites, A and B, each of mass m=950kg, are launched into circular Orbits around the Earth’s center. Satellite A orbits at an altitude of 4200 km, and satellite B orbits at an altitude of 12,600km. What are the kinetic energies of the t..
An Olympic pool has dimensions 50.0 m × 25.0 m × 2.68 m (length × width × depth). The density of the pool water is 1007 kgm-3. Atmospheric pressure (1.00 atm) is acting on the surface of the water.
the lowest pressure attained in a "vacuum" in a laboratory on the earth is 1X10^-17 atm at a termperature of 4.1 K. what is the number of molecules per cubic centimeter in this vacuum
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