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A small city requires about 17 of power. Suppose that instead of using high-voltage lines to supply the power, the power is delivered at 120 .Assuming a two-wire line of 0.40 -diameter copper wire, estimate the cost of the energy lost to heat per hour per meter. Assume the cost of electricity is...
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A rifle is aimed horizontally at a target 45m away. The bullet hits the target 1.5cm below the aim point. what is the time takes and the speed?
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A small, 300 g cart is moving at 1.50 m/s on an air track when it collides with a larger, 2.00 kg cart at rest. After the collision, the small cart recoils at 0.890 m/s. What is the speed of the large cart after the collision?
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A crate is pulled to the right(positive x axis) with a force of 82.0 N, to the left with a force of 115 N, upward with a force of 565 N, and downward with a force of 236 N. Find the magnitude and direction of the net force on the crate.
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A thin 2.5kg box rests on a 5.5kg board that hangs over the end of a table. The portion of the board on the table measures .30m and the portion of the table measures .20m. How far can the center of the box be over the table before the board begins to tilt?
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A 19 kg box slides d = 5 m down the frictionless ramp shown in Figure CP10.69, then collides with a spring whose spring constant is 250 N/m. angle is 30 degrees.
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A 14 g ball of clay traveling east at 4.0 m/s collides with a 30 g ball of clay traveling north at 2.0 m/s. What are the speed and the direction of the resulting 44 g ball of clay?
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a 3.0 kg block being pulled across a table by a horizontal force of 80N also experiences a frictional force of 5N what is acceleration of the block?
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A student has two ramps, both of which are at an angle 34 . Ramp 1 is frictionless and ramp 2 has friction. The student also has two blocks, one for each ramp. She pushes the blocks up the ramps with the same initial velocity. The block on ramp 2 only travels a fraction f = 0.570 as far as the...
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Sam, whose mass is 78.0 kg, takes off down a 52.0 m high, 8.00^\circ slope on his jet-powered skis. The skis have a thrust of 220 N. Sam's speed at the bottom is 45.0 {\rm m/s}.What is the coefficient of kinetic friction of his skis on snow?
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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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