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In a high speed elevator, passengers accelerate straight upward from rest to 15 km/hr in 5.25 seconds. What is the average acceleration of the passengers in this elevator?
A friend of yours who starts out at the same age as you travels to the alpha centauri solar system which is 4.70 light-years away. How fast did she travel
Each of three tuning forks, A, B, and C, has a slightly different frequency. What is the smallest possible beat frequency when B and C are sounded together
You attach a meter stick to an oak tree, such that the top of the meter stick is 2.67 meters above the ground. how high above the ground was the acorn before it fell
A skydiver reaches a "terminal velocity" of 120 km/h. If the skydiver has a mass of 59kg, what is the magnitude of the upward force on the skydiver
The first accurate estimate of cell membrane thickness used a capacitive technique, which determined the capacitance per unit area of cell membrane in a macroscopic suspension of cells; find the membrane's thickness
The real image of an object is located 45.0cm away from a concave mirror, which has a focal length of 10.0cm. How far is the object from the mirror
A 7.80-g bullet moving at 650 m/s penetrates a tree trunk to a depth of 5.4 cm. Use work and energy considerations to find the average frictional force that stops the bullet
A certain solid-propellant model rocket engine releases a total of 6000 J as it burns. what fraction of the chemical energy released by the engine is wasted in the form of thermal energy in the air
A window washer pulls herself upward using the bucket-pulley apparatus shown in Fig. 4-42. The mass of the person plus the bucket is 60 kg. (a) How hard must she pull downward to raise herself slowly at constant speed? If she increases this force by ..
When ultraviolent light with a wavelength of 262nm falls upon a clean metal surface, What is the photoelectic threshold wavelength for this metal
A girl is using a rope to pull a box that has mass of 30kg across a level surface with constant velocity. What is the normal force of the floor on the box
Police investigators, examining the scene of an accident involving two cars, measure 72-m-long skid marks of one of the cars, Estimate the initial speed of that car assuming a level road
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