A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil with a density of 800 kg/m3 and capped at both ends with tight-fitting pistons
The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at the same level. What is the force that must be applied to the smaller piston in order to lift the car after it has been raised 1.20 m? For purposes of this problem, neglect the weight of the pistons.
A) 1.88 kN B) 0.954 kN C) 3.67 kN D) 1.96 kN E) 1.20 kN
D
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A 5000-kg freight car collides with a 10,000-kg freight car at rest. They couple upon collision and move at 2 m/s. What was the initial speed of the 5000-kg car?
A) 4 m/s B) 5 m/s C) 6 m/s D) 8 m/s E) none of the above
Fusion is used to produce the largest nuclei known to exist
a. True b. False Indicate whether the statement is true or false
The speed of sound in air is dependent upon the air temperature and other factors. The speed of sound increases from 334 m/s to 341 m/s between 8:00am and 11:00am. If a horn produces sound with wavelength 0.75 m at 8:00am, what would it produce at 11:00am?
A. 73 cm B. 77 cm C. Not enough info given to solve. D. 75 cm
Answer the following statement(s) true (T) or false (F)
Which of the following pairs of forces are third-law partners? Answer T if the two forces described are third-law partners, F if they are not. 1. A thrust force from its propeller pulls a plane forward; a drag force pushes it backward. 2. A car exerts a forward force on a trailer; the trailer tugs backward on the car. 3. A motorboat propeller pushes backward on the water; the water pushes forward on the propeller. 4. Gravity pulls down on a person sitting in a chair; the chair pushes back up on the person.