From the Earth, the Earthlings see the Enterprise approaching from the west at 0.800c and the Klingons approaching from the east at 0.900c. What speed, in terms of the speed of light, does the crew of the Enterprise measure for the Klingon ship?
What will be an ideal response?
0.988c
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A 2.00-m long piano string of mass 10.0 g is under a tension of 320 N. Find the speed with which a wave travels on this string. Group of answer choices
a. 506 m/s b. 253 m/s c. 126 m/s d. 358 m/s e. 80.0 m/s
The mass of a hot-air balloon and its cargo (not including the air inside) is 250 kg. The air outside is at a temperature of 10°C and a pressure of 1 atm = 105 N/m2 . The volume of the balloon is 400 m3 . Which temperature below of the air in the balloon will allow the balloon to just lift off? (Air density at 10°C is 1.25 kg/m3.)
a. 37°C c. 99°C b. 293°C d. 200°C
Consider a wire in a magnetic field, as shown in the following figure, with a current flowing downward through it. What will happen to the wire?
a.
The wire will be forced toward the north pole.
b.
The wire will be forced perpendicular to the plane of the magnetic field, into the page.
c.
The wire will be forced perpendicular to the plane of the magnetic field, out of the page.
d.
The current will cease flowing.
e.
The wire will be forced toward the south pole.
A pure substance A having density of 800 kg/m^3 (56 lbm/ft^3) is diffusing into a binary mixture of A and B. If the velocity of A is 4 cm/hr (1.2 in/hr) into the mixture and the velocity of B is 3.6 cm/hr out of the mixture, what is the total bulk velocity? Assume that the density of pure B is 900 kg/m^3 (63 lbm/ft^3) and that the mixture density is 890 kg/m^3 (61 lbm/ft^3).
What will be an ideal response?