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A ball is thrown vertically upward with a speed of 1.86 m/sfrom a point 3.82 m above the ground. calculate the time in which the ball will reach the ground.
It takes the elevator in a skyscraper 4.5s to reach its cruising speed of 12m/s. What is the passenger's weight before the elevator starts moving
ferromagnetism is caused by:
A Jetliner with an airspeed of 1000km/h sets out on a 1500-km flight due south. To maintain a southward direction, however, the plane must be pointed 15 degrees west of south. If the flight takes 100 min, what is the wind velocity ?
While looking at her image in a cosmeticmirror, Dina notes that her face is highly magnified when she isclose to the mirror, What is the focal length of the mirror
A toy top has a string wrapped around its body. The string has a length of 64cm and is wrapped around the top at a place where its radius is 2.0cm. What is the final angular velocity in rpm of the top when the string is completely unwound
If electrons are accelerated from rest in an electron gun by sending them through a potential difference of 11.0 kV, what is the resulting kinetic energy of each electron?
An elevator cable can withstand a maximum tension of 19,500N before breaking. The elevator has a mass of 480 kg and a maximum acceleration of 2.24 m/s2. Engineering safety standards require that the cable tension never exceed two-thirds of the breaki..
A weightlifter curls a 35kg bar, raising it each time a distance of 0.65m. How many times must he repeat this exercise to burn off the energy in one slice of pizza
One end of a metal rod is in contact with a thermal reservoir at 691 K, and the other end is in contact with a thermal reservoir at 105 K. what is the change in entropy of the rod
The normal range of hearing is about 20 to 20000 Hz. Assume that your hearing range is 26 to 18500 Hz. (Use 340 m/s as the speed of sound.) What is the greatest length of an organ pipe that would have its fundamental note in your hearing range if i..
An object is acted on by a drag force with a magnitude that is proportional to the speed. The object accelerates downward at 3.00 m/s2 when it is falling with a speed 20.0 m/s. What is the terminal speed of the object as it is falling.
If the uncertainty in the energy of an excited state is a billionth of an electron volt (1 neV), what is the half-life of the state
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