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You are moving into an apartment and take the elevator to the 6th floor. Suppose your weight is 663 N and that of your belongings is 1028 N. (a) Determine the work done by the elevator in lifting you and your belongings up to the 6th floor (15.2 m) at a constant velocity. Work = (b) How much work does the elevator do on you alone (without belongings) on the downward trip, which is also made at a constant velocity?
A piston, A, as shown below, has a diameter of 0.54cm. A second piston, B has a diameter of 3.7 cm. find the force, F, necessary to support the 500N weight in the absence of friction.
As part of the safety investigation, two 1400 {rm kg} cars travelling at 23 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.7 {rm s} to stop, and (b) car that hits..
In a certain region, the earth's magnetic field has a magnitude of 4.7 x 10-5 T and is directed north at an angle of 42° below the horizontal. Determine the bullet's electric charge
what is the concentration of the cd in the soil if the city of des moines adds 3 tons of compost acre-6 inches given
Initially an unpolarized light with intensity I is sent through a polarizer with its axis set to zero degrees. what is the angle of the second polarizer
You're burning calories by weight lifting. You lift a 65kg barbell and 1.8m and repeat 15 times. How much energy in Cal do you expend
A Speaker (which is to be treated as the source point) emits sound at a frequency of 4x10^3 Hz and a power of 28 Watts. What is the power intercepted by your ear
A positively charged oil drop of mass is injected into a region of uniform electric field between two oppositely charged, horizontally oriented plates spaced 16 cm apart. what is the magnitude of the charge on the drop
A large steam pipe is covered with 1.7-cm-thick insulating material of thermal conductivity 0.31 J/(s m °C). How much energy is lost every second when the steam is at 185 °C
A simple pendulum has a mass of 0.350 kg and a length of 7.00 m. It is displaced through an angle of 12.0° and then released, What is the maximum angular acceleration
one of your classmate has a friend with a boat. here is your classmate on water-skis being towed. what is the friction force of the water
A transverse wave propagates in the positive x-axis with a wavelength of 0.3m and a period of 0.001s. what is the frequency of this wave
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