Hydrogen is the major gas in the interstellar medium
Indicate whether the statement is true or false
TRUE
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A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with incompressible 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, you can neglect the weight of the pistons.) A) 0.954 kN B) 1.88 kN C) 1.96 kN D) 3.67 kN E) 1.20 kN
Why do astronomers speak in terms of redshifts rather than distances to faraway objects?
What will be an ideal response?
An auto is moving at a steady 50 mph up a long straight [constant "slope"] incline. While it is on this incline,
A) its acceleration is zero but its velocity is not zero. B) its velocity and acceleration are both zero. C) its velocity is zero but its acceleration is not zero [i.e., it does have an acceleration]. D) neither its velocity nor its acceleration are zero. E) it has the heebie-jeebies.
A 385-g tile hangs from one end of a string that goes over a pulley with a moment of inertia of and a radius of 15.0 cm. A mass of 710 g hangs from the other end of the string. When the tiles are released, the larger one accelerates downward while the lighter one accelerates upward. The pulley has no friction in its axle and turns without the string slipping. What is the tension in the string on the side of the 710-g tile?
A) 9.77 N B) 6.87 N C) 5.59 N D) 4.41 N E) 3.68 N