Physics 105 Quiz - A

Starting from rest, a car accelerates in a straight line, achieving speed v in T seconds. Assume that the power delivered by the car’s engine remains constant, how much time does it take for the car to accelerate from v to 2v?

A show, a horizontal force F is pushing a 1.4 kg block up a frictionless 14° incline from point A to point B which are 1.2 m apart. The work exerted by F on the block is 5 J. If the kinetic energy at point B is 4 J, the kinetic energy (in J) at point A is:

From rest, a 2.3 kg block slides down a frictionless hill and then across a rough patch that has a coefficient of kinetic friction of 0.64. As shown, the velocity of the block after crossing the rough patch is 3.5 m/s directed to the left. What is the vertical height of the hill, h (in m)?

A square of side L is free to rotate about the point P – at the middle of the lower side – as shown in the figure. All five forces acting on the square have the same magnitude. Rank the five torques, τ, produced by those forces, from the greatest to the smallest.

A massive crane (assume it is fixed to the Earth) is lifting a mass of 7600 kg. The arm of the crane is supported at its base at point B by a strong pivot and at its top at point A by a cable. The arm makes an angle with the horizontal of 40 and the cable makes an angle 30 with the horizontal as well. The arm is 12.0 m long. The mass is lifted from a point on the arm 0.52 m from the end point A. Assume that the mass of the arm is small enough to ignore, find the tension in the cable

Assume that blood flows into the aorta at 1.0 m/s for 0.5 s, from which it flows then through an artery at 0.6 m/s for another 0.5 s. The average speed (in m/s) of the blood through the total time elapsed is:

A 4 kg steel ball of the density of ( 7.8*10^3 kg/m^3 ) suspended from a rope is partially immersed in water of the density of (10^3 kg ⁄ m^3 ). If one-third of the ball’s volume is below the surface of the water, the tension (in N) in the rope is:

The schematic diagram for a hydraulic lift shows two pistons in a container filled with a fluid ( of density of (750 kg/m^3 ). The larger piston on the right has a diameter of 13 cm and a mass of 3.6 kg , while the piston on the left has a diameter of 5.1 cm and a mass of 2.3 kg. The height difference h (in m) between the two pistons is:

Consider that your average blood pressure is (1.33 N/cm^2) and your blood flow rate is (105 cm^3/s ) . The energy your heart does provide in one day is used to lift a 72 kg box vertically to a height h. Calculate the height h (in m).

The density of salt water is 1.02 greater than the density of fresh water. A box floats in static equilibrium in both fluids. Which of the following statements is correct?