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(a) Calculate how much power is needed to push a 91 kilogram chest at 0.67 m/s along a horizontal floor where the coefficient of friction is 0.78?
W
(b) Find how much work is done in pushing the chest 9 m?
kJ
A straight wire segment 4 m long makes an angle of 30° with a uniform magnetic field of 0.37 T. Find the magnitude of the force on the wire
Two blocks are connected by a string over a frictionless, massless pulley such that one is resting on an inclined plane of 60 degrees and the other is hanging over the top edge of the plane. what is the value of kinetic friction
A Cepheid variable in a nearby galaxy looks 106 times fainter than an identical Cepheid in the Milky Way. How far away is the nearby galaxy
Consider a gas of neutrons in a nuclear reactor. The neutron density is 10^8 neutrons/cm^3 in an operating reactor which has a core temperature of 535K. Are the neutrons in the reactor core a classical gas or a quantum mechanical gas and how ca n yo..
Two planes approach each other head-on. Each has a speed of 705 km/h, How much time do the pilots have to take evasive action
a person of weight 80 kg jumped off a platform of height 1 m and safely landed on his feet. what is the magnitude of
four identical metallic objects carry the following charges 1.29 6.21 -4.54 and -9.14c. the objects are brought
An oxygen molecule has a vibrational mode that behaves approximately like a simple harmonic oscillator with frequency 2.99 X 10^14 rad/s. Calculate the energy of the ground state
A series AC circuit contains a resistor, an inductor of 200 mH, a capacitor of 5.20 µF, and a source with ?Vmax = 240 V operating at 50.0 Hz. The maximum current in the circuit is 180 mA.
A ballplayer standing at homeplate hits a baseball that is caught by another player at the same height above the ground from which it was hit. How high will the ball rise
A proton with v = 374 m/s is moving through a region in which the magnetic field is B = 2.8 T. what angle does the protons velocity make with B
A 1000-kilogram race car is traveling at 60 m/s around a curved section of track that has a radius of 300 m. What is the car's centripetal acceleration? What is the centripetal force that acts on the car?
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