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# Various Physics (Mechanics) Problems

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37. A block whose weight is 45.0 N rests on a horizontal table. A horizontal force of 36.0 N is applied to the block. The coefficients of static and kinetic friction are 0.650 and 0.420, respectively. Will the block move under the influence of the force, and, if so, what will be the block's acceleration? Explain your reasoning.

47. A supertanker (mass = 1.70 X 108 kg) is moving with a constant velocity. Its engines generate a forward thrust of 7.40 X 105 N. Determine (a) the magnitude of the resistive force exerted on the tanker by the water and (b) the magnitude of the upward buoyant force exerted on the tanker by the water.

51. A stuntman is being pulled along a rough road at a constant velocity, by a cable attached to a moving truck. The cable is parallel to the ground. The mass of the stuntman is 109 kg, and the coefficient of kinetic friction between the road and him is 0.870. Find the tension in the cable.

63. Only two forces act on an object (mass = 4.00 kg), as in the drawing. Find the magnitude and direction (relative to the x axis) of the acceleration of the object.

67. In the drawing, the weight of the block on the table is 422 N and that of the hanging block is 185 N. Ignoring all frictional effects and assuming the pulley to be massless, find (a) the acceleration of the two blocks and (b) the tension in the cord.

73. A 1.14 X 104-kg lunar landing craft is about to touch down on the surface of the moon, where the acceleration due to gravity is 1.60 m/s2. At an altitude of 165 m the craft's downward velocity is 18.0 m/s. To slow down the craft, a retrorocket is firing to provide an upward thrust. Assuming the descent is vertical, find the magnitude of the thrust needed to reduce the velocity to zero at the instant when the craft touches the lunar surface.

https://brainmass.com/physics/work/various-physics-mechanics-problems-47399

#### Solution Summary

This post provides step by step solutions solving for acceleration, force, tension, and velocity.

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## Physics: Series and Parallel resistors. Which statements are true?

You have two resistors with different values. They may be combined either in series or in parallel, and that combination is then connected to a battery. Which of the following statements are true?

(T/F) to minimize the total power coming out of the battery, the resistors should be connected in parallel.

(T/F) to minimize the current through each resistor, the resistors should be connected in series

(T/F) to maximize the total current out of the battery, the resistors should be connected in parallel

(T/F) to minimize the total resistance of the circuit, the resistors should be connected in parallel

(T/F) to maximize the total voltage from the battery, the resistors should be connected in series

(T/F) to maximize the voltage across each resistor, the resistors should be connected in series

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