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When a body is completely or partially immersed in a fluid, the fluid experts exterts an upward force on the body equal to the weight of the fluid displaced by the body. Which of the following examples manifest the statement above?
i.submarine
ii.dentist's chair
iii.fish
iv.car lifts
v.hot air balloon
vi.hydraulic jacks
vii.ship
viii.car breaks
Choices:
A)i, iii, v, vii
B)ii, iv, vi, viii
C)i, iii, v, vi
A person pulls on a spring, stretching it 20 cm, which requires a maximum force of
800 N. Find the potential energy stored in the spring when it is stretched 20 cm and
compressed 5 cm.
An open cylindrical tank of 20 m high and 30 m in diameter is filled with water. Given
that the atmospheric pressure,
P
=1.013 × 105 N/m2
.
i) Determine the water pressure on the bottom of the tank.
ii) Calculate the total force on the bottom of tank.
A person pulls on a spring, stretching it 15 cm, which requires a maximum force of 750 N. Find the potential energy stored in the spring when it is stretched by 15 cm and compressed by 5 cm.
1. A 1-kg metal sample is heated to 90°C and then dropped into an insulated container containing 200 mL of water at 25°C. When thermal equilibrium is reached, the temperature of water rose to 40°C. Which of the following statements is true after the metal sample is dropped into the beaker?
How does the strength of a magnetic field, 1 cm from a current-carrying wire, compare with each of the following. a.) the strength of the field that is 2 cm from the wire. b.) the strength of the field that is 3 cm from the wire.
How fast would an 85-kg cheetah, which was recorded to have a power output equal to 660 hp, attain the same amount of power as a Ferrari V8, which produces 769 hp, to go around a lap in 3 minutes?
A hydraulic lift has input and output pistons with diameters of 0.12 m and 0.48 m, respectively. If a force of 275 N is exerted at the input piston, calculate the maximum mass that can be lifted by the output piston.
A cylindrical water tank of diameter 15.0 m and height of 5.5 m contains 7.0 m3 of water. Calculate the force on the base of the tank.
An elevator carrying 10 passengers through a height of 10 m from the ground has a mass of 2000 kg. Calculate the power required by the motor to lift the elevator if the time taken to lift the elevator to that height is 1 minute.
#331389 on Nov 2022