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A 42 kg pole vaulter running at 13 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her alti
Assume that at some point just outside the surface of the conductor, the electric field has magnitude and is directed toward the surface of the conductor. What is the charge density on the surface
A 400 gram block, attached to the end of an ideal spring (horizontal) with force constant k = 10 N/m. Compute the magnitude of the maximum acceleration of the block.
The following information came from the income statement of the Wilkens Company at December 31, 2007: sales $1,800,000; beginning inventory $160,000; ending inventory $240,000; and gross profit $600
(a) How long does the projectile remain in the air? (b) At what horizontal distance from the firing point does it strike the ground? (c) What is the magnitude of the vertical component of its veloci
Helium plus air density in the balloon is 0.247kg/m^3, and Helium density is 0.179kg/m^3. Ignoring the volume of the payload, find the volume of the balloon.
A 280 block on a 52.0 -long string swings in a circle on a horizontal, frictionless table at 55.0. What is the speed of the block? What is the tension in the string?
A 3.3 kg block slides along a frictionless horizontal with a speed of 6.2 m/s. After sliding a distance of 2 m, the block makes a smooth transition to a frictionless ramp inclined at an angle of 33?
Three teams are involved in pulling a 435 kg anvil. Team A is pulling with a force of 70 N to the East. Team B is pulling with a force of 126 N to the West. Team C is pulling with a force of 85 N t
What distance "d" do they travel while decelerating (c) what work "W" is done on them by the decelerating force are (d) "F", (e) "d", and (f) "W" for deceleration of 4.0 m/s^2 ?
What is the frequency of sound waves with a with a wavelength of 60 m traveling in air at a speed of 380 m/s?
A U-shaped tube is partly filled water and partly filled liquid that does not mix water. Both sides of the tube are open to the atmosphere. What is the density of the liquid?
A tennis ball of mass 8.0×10-2 {rm kg} and speed 33 {rm m/s} strikes a wall at a 45 ^circ angle and rebounds with the same speed at 45 ^circ.
A submarine is 325 m horizontally out from the shore and 115 m beneath the surface of the water. A laser beam is sent from the submarine so that it strikes the shore. If the beam strikes the top of
A student drops a ball from a height of 15.6 m and measures the time it takes to hit the ground as 1.81 s. In calculating the gravitational acceleration g (in order to compare to its theoretical va
A 5.00-kg ball, moving to the right at a velocity of +2.00 m/s on a frictionless table, collides head-on with a stationary 7.50-kg ball. Find the final velocities of the balls if the collision is (a
What is the magnitude of the maximum torque the crane can withstand if the maximum load the crane can handle is 738 N? What is the maximum load for this crane at an angle of 15° with the horizonta
It takes 140 J of work to move 2.7 C of charge from a positive plate to a negative plate. What voltage difference exists between the plates?
A rock of mass 44 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 252 N. What is the magnitude
The mirrors have a radius of curvature of 3.96m. What is the image distance if a customer is 15.9m in front of the mirror.
A 3.0-m-long rigid beam with a mass 120 {rm kg} is supported at each end. An 70 {rm kg} student stands 2.0 {rm m} from support 1. How much upward force does support 1 exert on the beam?
The Coulomb constant is 8.9875 109 N m2/C2. What is the magnitude of the total elec trostatic force on a third particle with charge 9 C placed on the x-axis at 2 cm?
A ball rolls horizontally off the edge of a tabletop that is 0.85 m high. It strikes the floor 2.80 m away from the edge of the table. What is the initial (horizontal) velocity of the ball? Ignore a
A dipole with dipole moment 1.6 {rm nCcdot m} is oriented at 45{^circ} to a 3.4 {rm MN/C} electric field. What is the magnitude of the torque on the dipole?
A rotating cylinder about 16 {rm km} long and 8.4 km in diameter is designed to be used as a space colony. With what angular speed must it rotate so that the residents on it will experience the same