The position of a cart that is oscillating on a spring is given by the equation x = (12.3 cm) cos[(1.26 s-1)t]. When t = 0.805 s, what are the (a) velocity and (b) acceleration of the cart?
What will be an ideal response?
(a) -13.2 cm/s (b) -10.3 cm/s2
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Find the magnetic energy stored in the air gap between two very large magnetic pole pieces, one North, one South, each with an area of 100 cm2. Assume the 0.05-T magnetic field is uniform within the 2-cm gap.
What will be an ideal response?
According to the theory of relativity, is everything relative?
A) No, lightspeed is not relative. B) No, time and space are not relative. C) No, mass is not relative. D) No, velocity is not relative. E) Yes.
What element are white dwarfs made of? Why?
What will be an ideal response?
A baseball (1 kg) has an energy of 100 joules. If its uncertainty in position is 1 m, what is the percentage uncertainty (Dp/p × 10^0) in the momentum of the baseball?
a. <<1% b. 1% c. 2% d. 5% e. 10%