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Q1. A car carrying a 77-kg test dummy crashed into a wall at 27m/s and is brought to rest in 0.1 s. demonstrate that the average force exerted by the seat belt on the dummy is 18,760N.
Q2. An astronaut is rotated in a horizontal centrifuge at a radius of 3.3 m. (a) what is the astronaut's speed if the centripetal acceleration has the magnitude of 6.4g? (b) How many revolutions per minute are necessary to produce this acceleration? (c) What is the period of the motion?
A comet has a very elliptical orbit with a period of 124.0 y. If the closest approach of the comet to the Sun is 0.09 AU, what is its greatest distance from the Sun
A meter stick is pivoted at the 0.50 m line. A 3kg object is hung from the 0.15-m line. Where should a 5kg object be hung to achieve equilibrium (the meter stick oriented horizontal and motionless)?
A power station with an efficiency of 0.5 generates 10^8W of electric power and dissipates 1.00 x10^8 W of thermal energy to the cooling water that flows through it.
A particular organic molecule forms an electric dipole by possessing an effective charge separation of 0.177 nm for a pair of ±1.60 × 10-19-C charges. find the magnitude of the molecule\'s electric dipole moment
A 0.46 kg block slides across a tabletop with initial velocity of 3.1 m/s, Find the average friction force that retarded its motion
A circular loop of wire of resistance R= .500 ohms and radius r=8.00cm is in a uniform magnetic field out of the page, Find the rate at which the field is changing
What frequency will hear after the train passes
A satellite is placed in orbit 9.00x10^5 m above the surface of the planet Jupiter. Find the orbital speed of the satellite
q1.a bat in a cave emits a sound pulse and receives an echo 0.22 second later. assuming that the speed of sound is 339
The tungsten filament of a certain 100 W light bulb radiates 4.00 W of light. Find the filament's temperature
A hollow sphere of negligible mass and radius R is completely filled with a liquid so that it's density is p. What is the density of the enlarged sphere
An equipotential surface that surrounds a point charge q has a potential of 585 V and an area of 1.27 m2. Determine q
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