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A special electronic sensor is embedded in the seat of a car that takes riders around a circular loop-the-loop at an amusement park. The sensor gauges the magnitude of the normal force that the seat exerts on a rider. The loop-the-loop ride is in the vertical plane and its radius is 21 m. sitting on the seat before the ride starts, a rider is level and stationary, and the electronic sensor reads 610 N. At the top of the loop, the rider is upside-down and moving, and the sensor reads 330 N. What is the speed of the rider at the top of the loop?
A particular freely falling object requires 1.95 s to travel the last 33.5 m before it hits the ground. From what height above the ground did it fall.
A cannon shoots a rock from the ground at an angle of 31.0° above the horizontal. What is the rock's speed in the horizontal direction just before it hits the ground
large transformers when used for some time become very hot and are cooled by circulating oil. the heating of the
An apparatus that liquefies helium is in a room maintained at 306 K. If the helium in the apparatus is at 4.0 K, what is the minimum ratio Qto/Qfrom, where Qto is the energy delivered as heat to the room and Qfrom is the energy removed as heat from t..
Consider a length of pipe in air. (Take the velocity of sound in air to be 343 m/s.) Calculate the length for a pipe that has a fundamental frequency of 360 HZ if the pipe is open at both ends
A 1,200 W hair dryer is operated on a 120 V circuit for 15 minutes. If electricity costs $0.10/kW h, what was the cost of using the blow dryer.
You want to support a sheet of fireproof paper horizontally using only a vertical upward beam of light spread uniformly over the sheet. There is no other light on this paper. The sheet measures 22.0cm by 28.0 cm and has a mass of 1.50g.
A motorist travelling at 82 km/hr is being chased by a police car at 131 km/hr. If the police car starts from 3.5 km back, how long does it take to catch the motorist? Leave time in hours.
Explain, using thermodynamically sound principles, what each of the following temperatures represents:
A transformer consisting of two coils wrapped around an iron coreis connected to a generator and a resistor, as shown in thedrawing. There are 11 turnsin the primary coil and 22 turns in the secondary coil. The peakvoltage across the resistor is 73.8..
part 1 what do you think of socrates conclusion that no person knowingly does evil and therefore all evil is ignorance?
a child is swinging on a swing set. if the chains holding the swing are 5m long, how fast will the child be moving at the lowest point in the swing
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