4071

Physics Circular Motion Level: Misc Level

A race car starts from rest on a circular track of radius 400 m. The cars speed increases at a constant rate of. 5 m/s ^2. At the point where the magnitudes of the centripital and tangential accelerations are equal,determine the speed of the car.the distance traveled, the elapsed time.




4070

Physics Circular Motion Level: Misc Level

A rotaing wheel requires 3 sec to rotate 37 revolutions. Its angular velocity at the end of the three second interval is 98 rad/sec. what is the constant angular acceleration of the wheel?




4069

Physics Circular Motion Level: Misc Level

The tub of a washer starts from rest and reaches an angular speed of 5 rev/sec in 8 sec. A person then stops the washer and the tub goes to rest in 12 sec. How many revolutions does the tub make during the 20 sec interval.




4068

Physics Circular Motion Level: Misc Level

Find the angular speed of the earth about the sun in radians per second ad degrees per day. (mean radius=6.38*10^6 m) (distance from sun=1.496x10^11 m) (Period earth =3.156*10^7 sec)




4067

Physics Force & Laws Of Motion Level: Misc Level

A 5,000- kg motorboat sits still on a frictionless lake.There is no wind to push against the boat. The captain starts the motor and runs it steadily for 12.0 seconds in direction striaght forward and then shuts the motor off.The boat has attained a velocity of 6.0 m/sec striaght forward. what is the average force supplied by the motor?




4066

Physics Work,Power & Energy Level: Misc Level

According to the law of Conservation of Momentum, in an ideal,isolated system, when two objects collide it does what?




4065

Physics Force & Laws Of Motion Level: Misc Level

A 50- lb block rests on a horizontal surface. A horizontal force of 10 lb must be applied to the block to set it into motion. Find the coefficient of static friction.




4063

Physics Work,Power & Energy Level: Misc Level

If a brick of mass 13.0 kg is dropped from a height of 45 m above the surface of the earth,what kinetic energy will it momentary possess at 1 m from the ground as it plunges earthwards?




4062

Physics Measurements Level: Misc Level

convert 100 mi/hr into m/sec:




4061

Physics Relativity Level: Misc Level

A mass of 19 kg moves at a constant speed of 1.0 m/sec relative to an observer. from the point of view of the observer, what is the magnatude of the force vector on that mass? assume the mass travels in a striaght line.




4058

Physics Work,Power & Energy Level: Misc Level

Consider a hockey player skating across the ice 12.0 m/sec. His weight is 800.0 N. what is the kentic energy?




4057

Physics Work,Power & Energy Level: Misc Level

Just before striking the ground, 2.0-kg mass has a kinetic energy of 400 J. Assuming that it was dropped from rest, determine the height from which it was released.




4054

Physics Circular Motion Level: Misc Level

8. A dentist causes the bit of a high - speed drill to accelerate from an angular speed of 1.45*104 rad/s to an angular speed of 3.14*104 rad/s. In the process, the bit turns through 1.88*104 rad. Assuming a constant angular acceleration. how long would it take the bit to reach its maximum speed of 7.85 *104 rad/s, starting from rest?




4053

Physics Work,Power & Energy Level: Misc Level

7. During a tennis serve, a racket is given an angular acceleration of magnitude 130 rad/s 2. At the top of the serve, the racket has an angular speed of 12 rad/s. If the distance between the top of the racket and the shoulder is 1.3 m, find the magnitude of the total acceleration of the top of the racket.




4052

Physics Circular Motion Level: Misc Level

6. An auto race is held on a circular track. A car completes one lap in a time of 17.5 s, with an average tangential speed of 37. 1 m/s. Find the following.

a) the average angular speed

b) the radius of the track


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