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An inflatable life raft is released from an air plane at 300 m altitude, in level flight, with an air speed of 120 m/s in the horizontal direction. Neglecting air resistance, how long before the raft strikes the water?
An archer is able to fire an arrow (mass 0.025 kg) at a speed of 65 m/s. If a baseball (mass 0.15 kg) is given the same kinetic energy, what is its speed
a 2 kg block is taken from a furnace where its temperature was 650 degree c and placed on a large block of ice at 0
Suppose the mean radius of a planet is 6.79 *10^6 m, and that of its moon is 1.80 * 1^8 cm. From these data calculate the following. Recall that the surface area of a sphere is 4pir 2 and the volume of a sphere is below. Find the ratio of the plan..
A shop sign weighing 230 N is supported by a uniform 115 N beam as shown in Fig. 9-54. find the vertical forces exerted by the hinge on the beam
A 35.0-g bullet moving at 475 m/s strikes a 3.2-kg bag of flour that is on ice, at rest. The bullet passes through the bag, leaving at 225 m/s. How fast is the bag moving while the bullet exits.
The molar volume of a certain solid is 142 mL at 1 bar and 427.15K, its melting temperature. Calculate the enthalpy and entropy of fusion of the solid
In the surface of a calm lake you see the image of a tree of height 25 m. The tree is on the opposite shore, 65 m away. How far is the image of the treetop from your eye
An object is launched from the ground with a velocity of 3.5 m/s at an angle of 35o. How far does the object go horizontally
An ac circuit contains a resistor with a resistance of 8.1ohms. The resistor has an rms current of 0.14A. Find the average power delivered to the resistor
How does the coefficient of static friction compare with the coefficient of kinetic friction for the same surfaces and areas - Why is it important to reduce friction during the operation of machinery?
Light rays from a distant point source are incident perpendicular to the flat side of a semicircular glass plate of radius5.0 cm and index 1.5. Discover the distance of the image from the center of the curved side.
A movable piston having a mass of 7 kg and a cross-sectional area of 6 cm2 traps 0.17 mol of an ideal gas in a vertical cylinder. The piston slides without friction in the cylinder. The outside of the cylinder is kept at atmospheric pressure, 1.01..
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