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To pull a 30 kg crate across a horizontal frictionless floor, a worker applies a force of 190 N, directed 20° above the horizontal. The crate moves 3.0 m. (a) What work is done on the crate by the worker's force? (b) What work is done on the crate by its own weight? (c) What work is done on the crate by the normal force exerted by the floor on the crate? (d) What is the total work done on the crate?
A concave mirror (R = 82.4 cm) is used to project a transparent slide onto a wall. The slide is located at a distance of 52.3 cm from the mirror, How far from the wall should the mirror be located
A bird stands on a dc electric transmission line carrying 2540 A, What is the potential difference between the bird's feet
A battery with a 12-V EMF has a terminal voltage of 11.4 V when it delivers 20A to the starter of a car. How much energy is dissipated per unit time by internal resistor
A student doing an experiment pours 0.160kg of heated copper shot into a 0.355-kg aluminum calorimeter cup containing 0.240kg of water. What was the initial temperature of the shot
Coherent light with wavelength 599nm passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3.00m from the slits. The first-order bright fringe is a distance of 4.84mm from the center of the central b..
How several meters away is a cliff if an echo is heard 0.587 s after the original sound? Assume that sound traveled at 343 m/s on that day.
A boy gets ready to slide down an icy hill with his sled.Assume that the friction from the ground is negligible. How far will the boy have slid after 3 seconds with that acceleration
What least amount heat is needed to bring 20-g of water at 20C to the boiling point and completely boil it away.
A steel ball is dropped from a building's roof and passes a window, taking 0.13 s to fall from the top to the bottom of the window, a distance of 1.20 m. How tall is the building
You want to propel a 1.50 kg t-shirt from a spring-loaded launcher to a velocity of 10.0 m/s. How far back do you have to compress the spring
If the pressure of the 3 cm3 volume is reduced to 2.0 10-11 Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container
A string of linear density 1.60 g/m is stretched between clamps 48.0 cm apart. the string does not stretch appreciably as tension in it is steadily raised from 15.0 N at t = 0 to 25.0 N at t = 3.50 s. Find the number of oscillations it completes du..
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