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A hiker, who weighs 916 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs3060 N, and rests on two concrete supports, one on each end. Hestops 1/4 of the way along the bridge. What is the magnitude of theforce that a concrete support exerts on the bridge(a) at the near end and (b) atthe far end?
An 7.60-cm-diameter, 310 sphere is released from rest at the top of a 1.70-m-long, 20.0 incline. What is the sphere's angular velocity at the bottom of the incline
An unknown material has a normal melting/freezing point of -20.6 °C, and the liquid phase has a specific heat capacity of 143 J/(kg C°). What is the latent heat of fusion of the unknown material
In the circuit shown in the figure (Figure 1) the current through the 12.0-V battery is measured to be 70.6 mA in the direction shown
A capacitor consisting of two parallel plates connected to a 9V battery has a capacitance of 4 X 10-6 Farad. What is the charge of the capacitor?
Whenever two Apollo astronauts were on the surface of the Moon, a third astronaut orbited the Moon. Determine the astronaut's orbital speed
a 400 kg mass is released at rest from a distance of two earth radii above the surface of the earth. find the speed of
A commuter train blows its horn as it passes a passenger platformat a constant speed of 40.0 m/s. What is the frequency observed bya person on the platform
Two small balls, each of mass 14g, are each charged with +9.0 nC. What distance apart must they be if the force on one of them has the same magnitude as the weight of that ball?
A metal sphere is filled with ammonia as part of a refrigeration device. what is the mass of the ammonia if it fills up half of the sphere
The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Find the period of the orbit
A baloon 1.2 g when empty has volume 800 cm ^3 and is filled with helium. density of air is 1.29 kg/m^3 while that of helium is .179 kg/m, calculate acceleration of balloon
a molecule of dna deoxyribonucleic acid is 2.16 microm long. the ends of the molecule become singly ionized negative on
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