The position of an object as a function of time is given by where and (a) Find the instantaneous acceleration at t =2.4 s. (b) Find the average acceleration over the first 2.4 seconds
What will be an ideal response?
Answer:
(a) 44 m/
(b) 18 m/
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What observation made of other stars seems to suggest the solar nebula theory is correct?
a. Stars are found to exist more often in binaries than by themselves. b. Protostars are seen to radiate much of their light at infrared wavelengths. c. Nearby stars tend to be low-mass red dwarfs. d. Young stars are found to have hot disks that surround them.
The density of the universe is large enough that gravity alone will eventually halt its expansion
Indicate whether the statement is true or false
While driving fast around a sharp right turn, you find yourself pressing against the car door. What is happening?
A. The door is exerting a rightward force on you. B. Centrifugal force is pushing you into the door. C. Both of the above. D. Neither of the above.
Maximum magnetic force occurs when electrons move
A) in the same direction as the magnetic field. B) opposite to the magnetic field direction. C) perpendicular to the magnetic field direction. D) at non-right angles to the magnetic field direction. E) none of the above