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Two trains, each having a speed of 26 km/h, are headed at each other on the same straight track. A bird that can fly 60 km/h flies off the front of one train when they are 59 km apart and heads directly for the other train. On reaching the other train it flies directly back to the first train,...
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An elastic cord is 59 long when a weight of 79 hangs from it but is 89 long when a weight of 160 hangs from it.
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A cab driver picks up a customer and delivers her 2.00 km away, driving a straight route. The driver accelerates to the speed limit and, upon reaching it, begins to decelerate immediately. The magnitude of the deceleration three times the magnitude of the acceleration. Find the lengths of the...
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A man pushes a lawn mower on a level lawn with a force of 210 N. If 30% of the force is directed horizontally, how much work is done by the man in pushing the mower 4.6 m?
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A sack of flour of mass 6.00-\rm kg is lifted vertically at a constant speed of 3.60 m/s through a height of 12.0 m. How great a force is required?
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Estimate the electric field at a point 2.40 {\rm cm} perpendicular to the midpoint of a uniformly charged 2.00-{\rm m}-long thin wire carrying a total charge of 4.00 \mu {\rm{C}}
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She moves at a constant speed in a constant direction. Express this thought in fewer words using your knowledge of Newton s Laws.
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. A luge and its rider, with a total mass of 72 kg emerges from a downhill track onto a horizontal straight track with an initial speed of 31 m/s. If they stop at a constant deceleration of 2.5 m/s^2, (a) What magnitude F is required for the deceleration force, (b) what distance...
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A uniform electric field, with a magnitude of 650 N/C, is directed parallel to the positive x-axis. If the electric potential at x = 2.7 m is 1 000 V, what is the change in potential energy of a proton as it moves from x = 2.7 m to x = 1.4 m? (qp = 1.6 10 -19 C)
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A car drives straight off the edge of a cliff that is 53 m high. The police at the scene of the accident note that the point of impact is 140 m from the base of the cliff. How fast was the car traveling when it went over the cliff?
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- The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
- (a) What is the average angular acceleration of the Earth?
- (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
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- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas
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