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The earth has difference sources of energy which have significantly helped human beings, what is the primary source of energy?
A car moving at 10 m/s encounters a bump that has a circular cross-section with a radius of 30 m. What is the normal force exerted by the seat of the car on a 60-kg passenger
In a ballistics test, a 25.0g bullet traveling horizontally at 1200m/s goes through a 40.0cm -thick 350kg stationary target, What average force does the bullet exert on the target
an apple crate with a weight of 375 N accelerates along a frictionless surface as the crate is pulled with a force of 19.5 N. what is the horizontal acceleration of the crate
A person wears a hearing aid that uniformly increases the sound level of all audible frequencies of sound by 27.8 dB. What is the intensity delivered to the eardrum
Communication satellites are placed in geosynchronous orbit, i.e., in circular orbit such that they complete one full revolution about the earth in one sidereal day.
A converging lens of focal length 0.187 m forms a virtual image of an object. What is the distance between the object and the lens
A 65.0-kg snowboarder works on a half-pine event from top of one side of the semicircle (7.00 m radius) to the other side. What is the minimum work that the snowboarder has to do
what are the three longest wavelengths for standing waves on a 300-cm-long string that is fixed at both ends in meters?
Explain why the electrostatic interaction in ionic solids would (if alone) result in the collapse of the crystal to zero size and what it is that prevents this collapse in real crystals (be sure to be explicit)
A positron emission tomography (PET) scanner examines the gamma rays emitted when positrons and electrons annihilate each other. What is the wavelength of the photons
A 1.0 m section of an aluminum wire with 2.0 mm diameter carries 1.0 Ampere of electric current in a circuit and has an DC electrical resistance of 0.00845Ω. The wire is along the x-axis, y=0 and z=0. What is the number of aluminum atoms in 1.0 m ..
A charge of +1.00 10-6 C is located 29 cm from a charge of -4.00 10-6 C. What is the magnitude of the force exerted on each charge
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