41. A car is moving in a circular path of radius 50 m with a speed of 20 m/s. What is the tangential acceleration of the car? a. 6.25 m/s² b. 0.625 m/s² c. 62.5 m/s² d. 625 m/s² E. Other:
Gravitational force
In nature, every object is attracted by every other object. This phenomenon is called gravity. The force associated with gravity is called gravitational force. The gravitational force is the weakest force that exists in nature. The gravitational force is always attractive.
Acceleration Due to Gravity
In fundamental physics, gravity or gravitational force is the universal attractive force acting between all the matters that exist or exhibit. It is the weakest known force. Therefore no internal changes in an object occurs due to this force. On the other hand, it has control over the trajectories of bodies in the solar system and in the universe due to its vast scope and universal action. The free fall of objects on Earth and the motions of celestial bodies, according to Newton, are both determined by the same force. It was Newton who put forward that the moon is held by a strong attractive force exerted by the Earth which makes it revolve in a straight line. He was sure that this force is similar to the downward force which Earth exerts on all the objects on it.
![41.
A car is moving in a circular path of radius 50 m with a speed of 20 m/s. What is the tangential acceleration
of the car?
a. 6.25 m/s²
b. 0.625 m/s²
c. 62.5 m/s²
d. 625 m/s²
E. Other:
42.
What can you say on the two forces acting on an object that is initially at rest for it to remain at rest?
a. the same magnitude, opposite directions c. different magnitudes, opposite directions
b. the same magnitude, the same direction d. different magnitudes, the same direction
E. Other:
43.
In the 2008 Olympics, Jamaican sprinter Usain Bolt shocked the world as he ran the 100-m
dash in 9.69 seconds. What is Usain's average speed for the race? Express your answer in the
nearest whole number.
a. 11 m/s
b. 10 m/s
c. 9 m/s
d. 8 m/s
E. Other:
44.
A truck travels 90 meters due north in 10 seconds. Then the car turns around and travels 40
meters due south. What is the magnitude and direction of the car's resultant displacement?
a. 40 m, South b. 50 m, South
c. 40 m, North
d. 50 m, North
E. Other:
45.
An object completes 1.5 circular orbits in half a minute. It orbits with a radius of 2 m.
What is its approximate angular velocity?
a. 0.05 rad/s
b. 0.30 rad/s
c.0.50 rad/s
E. Other:
d. 3 rad/s](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F000f2982-3c3c-4d1b-a74e-b4b6d47726ea%2Fb04edb51-2e0e-4f99-a25d-f1e76c2c218e%2Fggg9ke6_processed.jpeg&w=3840&q=75)
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