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A rock is dropped into a deep hole and 2.5 s later the sound of striking the bottom is heard. If the speed of sound is 340 m/s, what is the depth of the hole?
A solid spherical ball of mass 2.74 kg and radius 0.15 m rolls along a smooth, level surface with a speed of 2 m/s. How far up the plane does the ball go
The "reaction time" of the average automobile driver is about 0.7. Compute the total distance covered in coming to a stop after a signal is observed from an initial velocity of 14.6
Small rockets are used to make small adjustments in the speed of satellites. One such rocket has a thrust of 53 N. If it is fired to change the velocity of a(n) 66000 kg space craft by 99 cm/s, how long should it be fired? Answer in units of s.
The first-order principal maximum produced by a grating is located at an angle of ? = 11.6 degrees. What is the angle for the third-order maximum with the same light
An electromagnetic rail accelerator is used to launch a research probe vertically from the surface of the Moon. What height does it reach above the surface of the Moon
Two boxes, A and B, are connected by a (mass-less) cord and are resting on a smooth (frictionless) table. Find the tension force in the cord connecting the two boxes
A constant 6.0-N net force acts for 4.0 s on a 12 kg object. What is the object's change of velocity
The earth's orbit is nearly circular, but not quite.The radial motion oscillates in a narrow range around the minimum of the effective potential Ueff.We call this radius r*. If this range is narrow enough, Ueff may be approximated as A(r-r*)^2 - B..
When a certain spring is stretched by an amount x, it produces a restoring force of F(x) = ax=bx^2, where a and b are constants. How much work is done through an external force in stretching the spring by an amount D from its equilibrium length.
A 45.7-cm diameter disk rotates with a constant angular acceleration of 3.0 rad/s2. Find the linear velocity and tangential acceleration of P at t = 2.30 s
An automobile moves at a constant speed over the crest of a hill. the driver moves in a vertical circle of radius 17.5m. at the top of the hill, she notices that she barely remains in contact with the seat. find the speed of the vehicle.
Two identical positive charges exert a repulsive force of 6.4* 10^-9 N when separated by a distance of 3.8*10^-10 m. find the charge of each.
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