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A model helicopter pulls into a tight circular curve of radius 40.0 m. The 400 g helicopter is traveling at 90.0 km/h. What is the centripetal force that is acting on the helicopter?
A 0.464-nm photon collides with a stationary electron. After the collision, the electron moves forward and the photon recoils backwards. Find the momentum of the electron
An archer lines up an arrow on the horizontal exactly dead center on a target. She releases the arrow, and it strikes the target a distance h=7.6cm below the center. how long was the arrow in the air before striking the target
An object acted on by 3 forces moves with constant velocity. Evaluate the magnitude and direction of the third force acting on the object
In an experiment like you are going to do in Investigation 1 of lab this week, you count the number of beta rays from a 137Cs source. What is the average number of counts
A ball is thrown upward with a speed of 10m/s relative to aballoon that is 50m above the ground while it is moving downwardwith a speed of 5m/s. How long does the object take to hit the ground
A Carnot engine with a hot-reservoir temperature of 500 degrees C has a thermal efficiency of 26.3%. What is the cold-reservoir temperature in degrees C
An ocean wave has period 3.7 s and wavelength 11.2 m. (a) Find its wave number. m^-1 (b) Find its angular frequency. s^-1
Assume that while pecking on a tree the woodpecker's head comes to a stop from an initial velocity of 0.7 m/s over a distance of 0.003 m. Evaluate the magnitude of the corresponding deceleration in units of the acceleration due to gravity g. What is ..
A physics professor, equipped with a rocket backpack, steps out of a helicopter at an altitude of 592 m with zero initial velocity. (Neglect air resistance.), What is the duration of her slowing-down period
a how far from a 51.4 mm focal-length lens must an object be placed if its image is to be magnified 2.50 and be real?b
The downward acceleration of a 74-kg stuntwoman near the end of a fall from a very high building is 5.5m/s2
Cliff and Will support the board at each end so that it is horizontal. A 52 kg boulder is placed on a 2.00 m long board at a point that is x = 1.45 m from Cliff. What force does Will apply to the board
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