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Parachutist A parachutist weighing 80 kg, including the parachute, falls with the parachute open at a constant 8.5-m/s speed toward Earth.The drag coefficient Cd = 0.05. What is the area of the parachute?
A projectile is launched on level ground at an angle theta from the horizontal with initial speed v0. It reaches the ground again at a time t and at a location x, y. Discover a general expression for the time it takes to rise to the maximum height (y..
Describe the energy of a car driving up a hill. a. entirely kinetic b. entirely potential c. both kinetic and potential d. gravitational e. elastic Explain why
The pressure fluctuation of sound waves at the closed end of a pipe vibrating at resonance is: 1. Minimum 2. 1/2 minimum 3. unchanged 4. maximum 5. 1/2 maximum
When a 42.0-V emf device is placed across two resistors in series, a current of 12.0 A is flowing in each of the resistors. When the same emf device is placed across the same two resistors in parallel, the current through the emf device is 62.0 A. Wh..
A Carnot heat engine has a thermal efficiency of 0.615, and the temperature of its hot reservoir is 775 K. If 2375 J of heat is rejected to the cold reservoir in one cycle, what is the work output of the engine during one cycle?
Suppose a glob of chew-ing gum and a small, rubber ball collide head-on in midair and then rebound apart. Would you expect kinetic energy to be con-served? If not, what happens to the energy?
a model train moves along a horizontal circular track with a radius of 0.5 m. starting from rest the train
A 14.0 V battery is connected in series by a resistor and an inductor. The series circuit has a time constant of 600 µs, and the maximum current is 303mA. What is the value of the inductance?
Aluminum rivets used in airplane construction are made slightly larger than the rivet holes and cooled by "dry ice" (solid CO2) before being driven. what should be the diameter of a rivet
Compressed air is used to fire a 50 gram ball vertically upward from a 1.0 meter tall tube. Evaluate how high does the ball go above the top of the tube
the acceleration record shown was obtained during the speed trials of a sports car. knowing that the car startys from
Magnus has reached the finals of a strength competition. In the first round, he has to pull a city bus as far as he can. One end of a rope is attached to the bus, how much work does the tension force do on Magnus
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