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Atmospheric pressure is about 1.0 105 Pa on average.
(a) What is the downward force of the air on a desktop with surface area 0.1 m2? N
(b) Convert this force to pounds so you really understand how large it is. lb
(c) Why does this huge force not crush the desk?
A factory worker pushes a crate of mass 32.0kg a distance of 4.85m along a level floor at constant velocity by pushing horizontally on it. How much work is done on the crate by this force
A car of mass 150 kg is moving right with a velocity of 6 m/s and another one of mass 200 kg is moving left with a velocity of 4 m/s. find initial momentum of the system
A box is pushed a distance d along a ramp at a constant speed by a horizontal force, Fa. The mass of the box is m. The ramp is inclined at an angle of ? above the horizontal.
Given a pair of forces, one with magnitude 27.3 N at an angle of 24 degrees clockwise from the +x direction and the other with magnitude 15.7 N exactly in the +x direction: Find the direction of the acceleration
Suppose your 50.0 mm focal length camera lens is 53.5 mm away from the film in the camera. How far away is an object that is in focus
An insect 1.1 tall is placed 1.3 beyond the focal point of the objective lens of a compound microscope. The objective lens has a focal length of 17 , Where is the image formed by the objective lens
At a rock concert, the engineer decides that the music isn't loud enough. He turns up the amplifiers so that the amplitude of the sound, By what percentage does the intensity increase
A heat engine takes in 126 kJ of heat from a reservoir at 820 K and exhausts 88 kJ to a reservoir at 292 K. What is the efficiency of an ideal engine operating between the same two reservoirs
A stationary observer hears 597.6 Hz change to 447.8 Hz as a source of constant frequency passes at constant speed. find the source's speed and frequency
Light of wavelength 700 nm is incident on the face of a fused quartz prism (n = 1.458 at 700 nm) at an incidence angle of 72.4°. Calculate the angle of refraction at the first surface
A converging and a diverging lens of equal focal length are placed coaxially in contact. Find the focal length and power of the combination
An airplane is cruising at an altitude of 10 km. Model the air as an ideal fluid to find the speed of the stream of air flowing through the leak
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