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1. Birds can fly because air pressure is
A. greater above than below their wings.
B. the same on both sides of their wings.
C. greater below than above their wings.
D. transmitted through their wings.
2. Three containers are used in a chemistry lab. All containers have the same bottom area and the same height. A chemistry student fills each of the containers with the same liquid to the maximum volume. Which of the following is true about the pressure on the bottom in each container?
A. P1 > P2 > P3
B. P1 <P2 <P3
C. P1 <P2 >P3
D. P1 >P2 <P3
E. P1 =P2 =P3
- To increase pressure
A. Area of contact is increased C. Magnitude of thrust is decreased B. Area of contact is decreased D. None of these
2.What is the volume occupied by a kilogram of gold? (Recall that ρgold =2×104kg/m−3.)
A. 5×10−3 m3 C. 5×10−5 m3
B. 2×104 m3 D. 5×10−4 m3
3. The pressure of ocean water increases as the water
A. gets closer to shore C. gets shallower
B. becomes deeper D. two of the above
- Which statement is true?
A. For an ideal fluid flow, the greater the speed, the greater the pressure.
B. Atmospheric pressure decreases exponentially with increasing altitude.
C. Hydrostatic pressure exerted on a submerged object decreases with the depth of the object.
D. The pressure exerted at one point on a confined fluid at rest will decrease as it is transmitted to other parts of the fluid.
2.The difference between absolute pressure and atmospheric pressure is called
A. Air pressure C. gauge pressure
B. Barometric pressure D. hydrostatic Pressure
3. With the increase in the weight of an object the pressure
A. Increases C. remains the same
B. Decreases D. none of these
1. The density of a substance is 2500 kg/m3. What volume will 250 kg of this substance occupy?
A. 0.001 m3 C. 0.10 m3
B. 0.01 m3 D. 1.0 m3
2. In a typical hydraulic press, a force of 20 N is exerted on the small piston of area 0.050 m². The force exerted by the large piston on the load if it has an area of 0.50 m² will be
A. 200 N C. 50 N
B. 100 N D. 10 N
Consider the following situation׃ the force exerted on the small piston of a hydraulic lift is 160 N. The areas of the small piston and the large piston are 0.5 m2 and 1.0 m2, respectively.
1. What is the pressure exerted on the large piston?
A. 80 Pa C. 320 Pa
B. 160 Pa D. 640 Pa
2. What is the output force on the large piston?
A. 80 N C. 320 N
B. 160 N D. 640 N
3. Which term in Bernoulli’s theorem is referred to as the pressure head?
A. mgh C. v2/2g
B. P𝑚/𝜌 D. P/pg
the cubic expansivity of all gases at constant temperature is 1/2 73k. if a given mass of gas is held at 0C is 300cm^3, at what temperature does its volume becomes 400 cm^3?
A KTM commuter train travels between two stations, A and B. The train starts from rest from station A and accelerates at a constant rate for 0.5 km until it reaches a speed of 30 m/s. It then travels at this constant speed for T s before decelerating at a constant rate of 1.5 m/s2 and coming to rest at station B. Figure 1 shows the velocity-time graph of the train’s journey between the two stations. Determine the value of T if the distance between the two stations 6 km. Calculate also the total time taken for the whole journey.
A ball with a mass 0.5 kg is dropped from a height of 10 m to the ground and bounces back to a height of 7m. How much potential energy does the ball lose
How much work is done on the block if a 10.0 kg block was accelerated at 5.0 m/s2 with a distance of 2.5 m across a frictionless table?
Determine the mass of a moving object with a velocity of 35 m/s and a kinetic energy of 58 J.
