A 3-kg block rests on top of a 2-kg block supported by, but not attached to, a spring of constant 40 N/m. The upper block is suddenly removed. Determine (a) the maximum speed reached by the 2-kg block, (b) the maximum height reached by the 2-kg block.

A 3-kg block rests on top of a 2-kg block supported by, but not attached to, a spring of constant 40 N/m. The upper block is suddenly removed. Dete…

A 2000-kg automobile starts from rest at point A on a 6o incline and coasts through a distance of 150 m to point B. The brakes are then applied, causing the automobile to come to a stop at point C, 20 m from B. Knowing that slipping is impending during the braking period and neglecting air resistance and rolling resistance, determine (a) the speed of the automobile at point B, (b) the coefficient of static friction between the tires and the road.

A 2000-kg automobile starts from rest at point A on a 6 o incline and coasts through a distance of 150 m to point B . The brakes are then applied, ca…

(a) Suppose that a person has an average heart rate of 72.0 beats/min. How many beats does he or she have in 2.0 y? (b) In 2.00 y? (c) In 2.000 y?

(a) Suppose that a person has an average heart rate of 72.0 beats/min. How many beats does he or she have in 2.0 y? (b) In 2.00 y? (c) In 2.000 y?

The hypermetropia is a (a) short-sight defect (b) long-sight defect (c) bad vision due to old age (d) none of these Ans: (b) Solution: A person suffering from hyper metropia can see objects beyond a particular point called the near point. If the object lies at a point nearer than this point, then image is not formed at the retina. This is also known as long-sight defect.

The hypermetropia is a     (a) short-sight defect (b) long-sight defect (c) bad vision due to old age (d) none of these     Ans: (b) Solution: A p…

In semiconductors, at room temperature (a) the conduction band is completely empty (b) the valence band is partially empty and the conduction band is partially filled (c) the valence band is completely filled and the conduction band is partially filled (d) the valence band is completely filled

In semiconductors, at room temperature     (a) the conduction band is completely empty (b) the valence band is partially empty and the cond…

A galvanometer acting as a voltmeter will have [2004, 2002] (a) a low resistance in series with its coil. (b) a high resistance in parallel with its coil (c) a high resistance in series with its coil (d) a low resistance in parallel with its coil Ans: (c) Solution: A galvanometer can be converted into a voltmeter by connecting the high ressistance in series with the galvanometer so that only a small amount of current passes through i

A galvanometer acting as a voltmeter will have (a) a low resistance in series with its coil. (b) a high resistance in parallel with its coil (c) a…

A piece of copper and other of germanium are cooled from the room temperature to 80 K, then (a) resistance of each will increase (b) resistance of copper will decrease (c) resistance of copper will increase while that of germanium will decrease (d) resistance of copper will decrease while that of germanium will increase

Q:- A piece of copper and other of germanium are cooled from the room temperature to 80 K, then (a) resistance of each will increase (b) resistance …

The acceleration of a rocket traveling upward is given by a = (6 + 0.02s) * m / (s ^ 2) , where s is in meters. Determine the time needed for the rocket to reach an altitude of s = 100n . Initially, v = 0 and s = 0 when t = 0

Car B is traveling a distance d ahead of car A. Both cars are traveling at 60 ft/s when the driver of B suddenly applies the brakes, causing his car to decelerate at 12ft / (s ^ 2) It takes the driver of car A 0.75 s to react (this is the normal reaction time for drivers). When he applies his brakes, he decelerates at 15ft / (s ^ 2) . Determine the minimum distance d between the cars so as to avoid a collision.

Tests reveal that a normal driver takes about 0.75 s before he or she can react to a situation to avoid a collision. It takes about 3 s for a driver having 0.1% alcohol in his system to do the same. If such drivers are traveling on a straight road at 30 mph (44ft / s) and their cars can decelerate at 2ft / (s ^ 2) determine the shortest stopping distance d for each from the moment they see the pedestrians. Moral: If you must drink, please don't drive!

A 40-lb weight is dropped from a height of h = 2ft onto the center of the cantilevered A992 steel beam. If the beam is W * 10 * 15 , determine the maximum bending stress developed in the beam.

The 50 kg block is dropped from h = 0.9 m onto the cantilever beam. If the beam is made from A992 steel and isaW * 200 * 46 wide-flange section, determine the maximum bending stress developed in the beam.

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