12.7 ⚫ Oceans on Mars. Scientists have found evidence that Mars may once have had an ocean 0.500 km deep. The acceleration due to gravity on Mars is 3.71 m/s2. (a) What would be the gauge pressure at the bottom of such an ocean, assuming it was freshwater? (b) To what depth would you need to go in the earth's ocean to experience the same gauge pressure?

12.3 ⚫ You purchase a rectangular piece of metal that has dimensions 5.0 ×ばつ 15.0 x 30.0 mm and mass 0.0158 kg. The seller tells you that the metal is gold. To check this, you compute the average density of the piece. What value do you get? Were you cheated?

problem 2.5 in Modern Physics, 2nd ed, by Taylor et all

a Air B Water A+ Oil Mercury d = 66 cm. The pressure of Air (labelled) inside the tube is kPa.

R N Va R = 37 cm. Then vg is __ m/s.

This equipment part, m= 4 kg

he left ventricle of a patient pumps blood. The power of the heart to increase blood pressure is 1.2 W. Its flow rate is 336 cc/s. It increases blood pressure by _____ kPa.

Its angular speed is 1.3x106 rad/s. The circular path has a radius of _____ cm.

Hospitals use hydraulic stretchers The output piston cylinder has a 5cm radius . The foot pedal force is 300 N. It gives a hydraulic life force of 810 N. The input piston cylinder has _____ cm radius.

The ball has a mass of 400 grams

4 An elevator has a counterweight of 1200 pounds. A woman weighing 175 pounds, a man weighing 210 pounds, and a child weighing 57 pounds are in the elevator, whose empty weight is 980 pounds, when there is a catastrophic failure of the motor and multiply redundant safety mechanisms. Ignoring friction in the pulley and assuming it can be easily rotated (small moment of inertia - we will discuss this in greater detail later in the course) with what acceleration will the humans plummet? Answer Numeric 7 points An elevator has a counterweight of 1200 pounds. A woman weighing 175 pounds, a man weighing 210 pounds, and a child weighing 57 pounds are in the elevator, whose empty weight is 980 pounds, when there is a catastrophic failure of the motor and multiply redundant safety mechanisms. Using the same assumptions as in the previous question, the people are falling for 8 seconds of sheer terror before striking the ground. How fast were they moving when the struck they ground?

Work and Kinetic Energy Two masses are connected by a massless cable and they are accelerated up an incline by a second massless cable with tension T. There is kinetic friction between the incline and both masses. described by μk. 5. Draw free body diagrams for each mass with qualitatively correct vector lengths. M1 M e