Physics, 06.01.2021 19:50 fancycar14
A student uses a wheelchair to get around campus, which she travels to on a public bus. She boards the bus using a
motorized lift attached near the bus door. The electric lift motor uses 1.4 kilojoules of energy to raise the student and wheelchair from the sidewalk to the level of the bus interior, a total displacement of 0.75 meters. If the mass of the
wheelchair is 20 kilograms and the mass of the student and her belonqings is 60 kilograms, what is the efficiency of
the motor? (Estimate g as 10 m/s2.)
a) 2.3%
b) 11%
c) 32%
d) 43%
Answers: 1
Physics, 21.06.2019 13:00
During your summer internship for an aerospace company, you are asked to design a small research rocket. the rocket is to be launched from rest from the earth's surface and is to reach a maximum height of 910 m above the earth's surface. the rocket's engines give the rocket an upward acceleration so it moves with acceleration of 16.0 m/s2 during the time t that they fire. after the engines shut off, the rocket is in free fall. ignore air resistance.
Answers: 1
Physics, 21.06.2019 18:10
Achild throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. the ball leaves her hand 1.00 m above the ground. how long is the ball in flight before it hits the ground?
Answers: 1
Physics, 22.06.2019 19:00
1) what is the power in horsepower of a 100 watt light bulb? what is the power in kilowatts of a 200 horsepower engine? 2) if a cars engine is providing 3000 n of force to keep the car moving at 5 m/s, what is the engine’s effective power? 3) how many gallons of water will be pumped from a well 30 feet deep by a 1/2 hp engine in 1 minute? (1 gallon weighs 8.34 pounds)
Answers: 1
A student uses a wheelchair to get around campus, which she travels to on a public bus. She boards t...
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