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Q. An athlete at the gym holds a 1.8-kg steel ball in his hand. His arm is 74-cm long and has a mass of 4.00 kg. What is the magnitude of the torque about his muster if he holds his arm straight out, parallel to the floor?
Q. Water flows over Victoria Falls that is 128 m high, at an average rate of 1.2x10^6 kg/s. If one fourth the potential energy of this water were converted to electric energy, how much power would be produced by these falls?
A car drives north at 42 mi/h for 10 {rm min} and then turns east and goes 5.0 {rm mi} at 62 mi/h. at last, it goes southwest at 30 mi/h for 6.0 {rm min}.
A 60kg bicyclist rides his 7.8kg bicycle with a speed of 16m/s. How much work must be done by the brakes to bring the bike and rider to a stop.
An 8,000 rocket is shot straight up from the Earth's surface with the initial speed of 800 m/s. How high does it go.
In daily life we see many cases of people who are caught misrepresenting things who soon thereafter are excused and accepted by their contemporaries. How is This different in science.
A thin 12 cm long solenoid has a total of 490 turns of wire and carries a current of 1.9 A. find the magnitude of the field inside near the center.
What is the fractional change in the period of the pendulum.
As part of a safety investigation, two 1900 cars traveling at 23 are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.5 to stop, and (b) car that hits a concrete barrier and ta..
What is the magnitude of the force that maintains circular motion acting on puck.
When the front of the train passes the worker. A 1500 kg car moving north at 27.0 m/s is struck by a 2165-kg car moving east at 18.0 m/s. The cars are stuck together. How fast and in what direction do they move immediately after the collision.
he driver finds that the car bounces up & down with maximum amplitude when he drives at a speed of 4.2 m/s (approx 9.4 mph). The car then stops & picks up three more 110 kg passengers. By how much does the car body sag on its suspension when these ..
The Earth can be approximated as a sphere of uniform density, rotating on its axis once a day. The mass of the Earth is 5.97×1024 kg, the radius of the Earth is 6.38×106 m, and the time of rotation for the Earth is 24.0 hrs.
A Ferris wheel is a vertical, circular amusement ride with radius 6 m. Riders sit on seats that swivel to remain horizontal. The Ferris wheel rotates at the constant rate, going around once in 6.4 s. Consider a rider whose mass is 70 kg.
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