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A laserpointer has a beam intensity of 55 W/m2 and a beam radius of 2.1 mm. A first grader attempts to use it to move a black toy car. Assuming perfect absorption, what is the force on the car?
A satellite is in a circular orbit very close to the surface of a spherical planet. What is density (mass/volume) of the planet
One simple model for a person running the 100{\rm m} dash is to assume the sprinter runs with constant acceleration until reaching top speed, what will be his total time
The tank is shelling at a target that is 4km away and 60m above ground. what should be the release speed of the shell
An ideal monatomic gas initially has temperature Ti and pressure pi. It is to expand from volume Vi to volume Vf. If the expansion is isothermal, what are the final pressure and the work done by the gas
An ammeter with an internal resistance of 53.0 ? measures a current of 5.75 mA in a circuit containing a battery and a total resistance of 1290 ?. Determine the actual value of the current
A hotel elevator ascends 200 m with maximum speed of 5m/s . Its acceleration and deceleration both have a magnitude of 1.0 m/s^2 . a.)How far does the elevator move while accelerating to full speed from rest?
A tube with a 3.0-mm radius has ions flowing through it along its length. To determine the rate at which the charge is being moved through the tube, what is the magnitude of the current flowing through the tube
A block of mass m1 = 0.57kg is placed on top of another block of mass m2 =0.97kg, What minimum coefficient of static friction between the two blocks will prevent the upper one from slipping
A 0.15-kg apple falls off a tree branch that is 2.8m above the grass. The apple sinks 0.066m into the grass while stopping
A rocket which has an exhaust speed of 8 km/s is to have a lift off vertical acceleration of 8 m/s^2 from the NASA launch pad. at what minimum rate must the rocket consume fuel
an astronaut on mars might lean over the edge of 25.0 meter tall spacecraft, How much time will it take for the package to strike the ground
Jane, looking for Tarzan, is running at top speed (5.2m/s ) and grabs a vine hanging vertically from a tall tree in the jungle. How high can she swing upward
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