Course Code
phy301


Question
In elastic collisions,

Answer
both of the momentum and total kinetic energy are conserved.



Question
Tensile strain is equal to

Answer
Extension per unit length



Question
Bernoulli's principle states that, for streamline motion of an incompressible non-viscous fluid:

Answer
the pressure at any part + the kinetic energy per unit volume + the potential energy per unit volume = constant



Question
Young's modulus is defined as

Answer
tensile stress/tensile strain



Question
While Young's modulus ‘E’ relates to change in length and bulk modulus ‘K’ relates to change in volume, modulus of rigidity ‘G’ relates to change in:

Answer
shape



Question
A force applied to a rocket gives it an upward acceleration equal to 2 times the acceleration of gravity. The magnitude of the force is equal to:

Answer
three times the weight of the rocket



Question
A spring with a force constant of 100 Newtons per meter is loaded with a mass of 1.0 kilogram. The period of vibration of this system is:

Answer
0.63 seconds



Question
A satellite of mass "M" is in orbit around the earth. If a second satellite of mass "2M" is to be placed in the same orbit, the second satellite must have a velocity which is:

Answer
the same as the velocity of the first satellite



Question
A girl throws a 0.1 kilogram ball at a wall. The ball hits the wall perpendicularly with a velocity of 5 meters per second and then bounces straight back with a velocity of 4 meters per second. The change in the momentum of the ball is:

Answer
0.9 kilogram-meters per second



Question
A car is moving along a straight horizontal road at a speed of 20 meters per second. The brakes are applied and a constant force of 5000 Newtons decelerates the car to a stop in 10 seconds. The mass of the car is:

Answer
2500 kilograms


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