6836

Physics Force & Laws Of Motion Level: Misc Level

Acceleration is always in the direction;

a. of the displacement

b. of the initial velocity

c.of the final velocity

d. of the net force

e. opposite to the frictional force


6835

Physics Force & Laws Of Motion Level: Misc Level

The standard 1- kg mass is attached to a compressed spring and the spring is released. If the mass initially has an acceleration of 5.6 m/s2, the force of the spring has a 

a. 2.8 N

b.5.6 N

c.11.2 N

d. 0

e. an undetermined amount


6788

Physics Force & Laws Of Motion Level: Misc Level

An example of an inertial reference frame is;

a. any frame that is not accelerating

b. a frame attached to a particle on which no forces act

c. any frame that is at rest

d. a frame attached to the center of the universe

e. a frame attached to the Earth


6785

Physics Force & Laws Of Motion Level: Misc Level

If you know the impuise that has acted on a body of mass m you can calculate 

a. its initial velocity.

b.its final velocity.

c.its final momentum.

d.the change in its velocity.

e.its acceleration during the impulse.


6784

Physics Force & Laws Of Motion Level: Misc Level

A car of mass m1 traveling at velocity v passes a car of mass m2 parked at the side of the road. The momentum of the system of two cars is 

a.0.

b.m1 v.

c. (m1-m2)v.

d.m1v

m1 +m2

e. (m1+m2) v.


6781

Physics Force & Laws Of Motion Level: Misc Level

A 4.0 -kg particle is moving horizontally with a speed of 5.0 m/s when it strikes a vertical wall.The partical rebounds with a speed of 3.0 m/s. What is the magnitude of the impulse delivered to tthe particle?

a. 24 N-s

b.32 NN ss

c. 400 NN ss

d. 30N .s

e. 8.0 N.s


6780

Physics Force & Laws Of Motion Level: Misc Level

A 1.2 kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction .If the object is in contact with the wall for 2.0 ms. what is the magnitude of the average force on the object by the wall?

a. 9.8 kN

b.8.4 kN

c. 7.7 kN

d. 9.1 kN

e.1.2 kN


6671

Physics Force & Laws Of Motion Level: Misc Level

Consider a flat surface with a coefficient of friction of .20 with a 2.0 kg mass And a 3.0 kg mass connected together with a 6.0 kg mass along a slant as shown below. The coefficient of friction on the slant is zero. Calculate the acceleration of the system.


6657

Physics Force & Laws Of Motion Level: Misc Level

The distance between two telephone poles is 50 m. When a 1.00Kg bird lands on the telephone wire midway between the poles, the wire sags 0.200 m. Draw a free body diagram of the bird. How much tension does the bird produce in the wire? (Ignore the weight of the wire)

 


6509

Physics Force & Laws Of Motion Level: Misc Level

A 46.0 kg ballet dancer stands on her toes during a performance with four square inches (26.0 cm2) in contact with the floor. What is the pressure exerted by the floor over the area of contact in the following cases? If the dancer is leaping upwards with an acceleration of 4.00 m/s2.---Pa


6507

Physics Force & Laws Of Motion Level: Misc Level

If the shear stress in steel exceeds about 3.70 108 N/m2, the steel ruptures.Determine the shearing force necessary to punch a 1.00 cm diameter hole in a steel plate 0.450 cm thick.-----N


6492

Physics Force & Laws Of Motion Level: Misc Level

Suppose that a girl weighing 125 pounds is wearing spike" heel shoes. If the surface of the heel in contact with the floor corresponds to a square measuring 1/4 on each side, and if she stands momentarily with all her weight on one heel, what is the pressure she exerts on the floor?

a.125 Ibs/in2

b. 500 Ibs/in2

c. 1000 Ibs/in2

d.1250 Ibs/in2

e. 2000 Ibs /in2


6490

Physics Force & Laws Of Motion Level: Misc Level

When a force is applied to a certain rod, there is a 1 cm change in length. If that same force is applied to a rod that is three times bigger in each dimension, what will be the change in length?

a. 9 cm

b. 3 cm 

c.1 cm 

d.0.33 cm 

e.0667 cm


6356

Physics Force & Laws Of Motion Level: Misc Level

If you blow up a balloon, and then release it,  theballoon will fly away as air rushes out. This is an illustration of-Galleo,s law of inertia, Newton,s 2 nd law, 1 or,st law or third law.


6348

Physics Force & Laws Of Motion Level: Misc Level

The force that a squirrel exerts on a nut it has found is observed over a 10 second interval, as shown in the graph. What is the average power exerted by the squirrel?


Displaying 61-75 of 709 results.