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A worker stands still on a roof sloped at an angle of 23° above the horizontal. He is prevented from slipping by a static frictional force of 540 N. Find the mass of the worker.
A force of 7 pounds is required to hold a spring stretched 0.5 feet beyond its natural length. How much work (in foot-pounds) is done in stretching the spring from its natural length to 0.9 feet be
A ray of light traveling in air strikes the surface of mineral oil at an angle of 23° with the normal to the surface. If the light travels at 2.17 multiplied by 108 m/s through the oil, what is
The current in the speaker will be 2.9 A when the force on the speaker coil is 14.8 N. What strength magnetic field will give this force?
The largest block in the great pyramid wiegh 15 ton (about 13,000 kg). Dragging such a block up a ramp with a mechanical advantage of 3 would require a force of 4.5*10^4n.if 9.0*10^5 j of work was d
An electric field of intensity 4.3 kN/C is applied along the x-axis. Calculate the electric flux through a rectangular plane 0.350 m wide and 0.700 m long if the following conditions are true:
During liftoff, a hot air balloon accelerates upward at a rate of 3.3m/s^2. The balloonist drops a sand bag over the side of the gondola when the speed is 15 m/s.m What is the magnitude of the objec
Which is basically a diskshaped grindstone of mass 1.5 kg and radius 10.00 cm which operates at 700 rev/min. When the power is shut off, you time the grindstone and find it takes 26.1 s for it to st
Calculate the ratio of the gravitational force the doctor exerts on the baby to the gravitational force that Mars exerts on the baby.
A transverse wave on a string is described by the following equation. What distance does the wave travel during this time interval?
A rifle is aimed horizontally at a target 55.0 m away. The bullet hits the target 2.80 cm below the aim point.What was the bullet's flight time?
A 23 {rm kg} child goes down a straight slide inclined 38degrees above horizontal. The child is acted on by his weight, the normal force from the slide, and kinetic friction.
An 83 kg skier is sliding down a ski slope at a constant velocity. The slope makes an angle of 16° above the horizontal direction. Neglecting any air resistance, what is the force of kinetic fri
A novice skier, starting from rest, slides down a frictionless 28.0 incline whose vertical height is 170 . How fast is she going when she reaches the bottom?
A slingshot fires a pebble from the top of a building at a speed of 20.0 m/s. The building is 28.0 m tall. Ignoring air resistance, find the speed with which the pebble strikes the ground when the p
An Olympic skier moving at 15 m/s down a 28 degree slope encounters a region of wet snow of coe?cient of kinetic friction µ = 0.65. The acceleration of gravity is 9.8 m/s How far down the slope
It is immersed in 192 g of water, and the final temperature of the water and thermometer is 56.6 °C. What was the temperature of the water in degrees Celsius before the insertion of the thermome
1. Derive the Rydberg Equation from the definition of energy and wavelength emitted from known energy levels. Find the Rydberg Constant.
An electric vehicle starts from rest and accelerates at a rate of 2.4 m/s2 in a straight line until it reaches a speed of 21 m/s. The vehicle then slows at a constant rate of 1.4 m/s2 until it stops
A shell is fired from the ground with an initial speed of 1.67 103 m/s at an initial angle of 30° to the horizontal. (a) Neglecting air resistance, find the shell's horizontal range.
The ghost is about 1 cm to the right of the principal image if the reflected signal arrives .6 us after the principal signal. In this case, what is the difference in the distance traveled by the two
Estimate the time the ball is in contact with the floor to be 0.06 seconds. Calculate the average force the floor exerts on the ball.
A 0.80 kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.2 m on a frictionless horizontal surface.If the cord will break when the tension in it exceeds 55 N , wha
A 0.30 kg softball has a velocity of 12 m/s at an angle of 35° below the horizontal just before making contact with the bat. The ball leaves the bat 2.0 ms later with a vertical
A particle of mass 1.20 kg with a charge of +2.30 mC is shot into a region with an electric field of strength 18.0 N/C, having a direction opposite the particle's velocity. If the particle has an in