The astronauts feel weightless in the International Space Station, which orbits the Earth once every 90 minutes. Why?
A) because they are moving so fast
B) because the gravity from the Moon cancels out the gravity from Earth
C) because they and the space station are both falling around the Earth
D) because there is no gravity in space
C
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Copper is usually the material of choice for the wire in a coil to produce a magnetic field and in wiring for electric motors. Copper wire is placed in a magnetic field (H) of 1×106 A/m. The magnetic susceptibility of copper is –9.7×10-6
(a) Determine the intensity of magnetization (M) in the Cu. Is this M in the same direction or opposed to H? (b) What is the average dipole moment per atom (pa) in Cu that is parallel or antiparallel to H when subjected to the applied magnetic field magnetic field?
Why can infrared telescopes operate from high flying aircraft and high mountain tops whereas X-ray telescopes must be placed in orbit?
What will be an ideal response?
Projectile Motion: As shown in the figure, a heavy rock is shot upward from the edge of a vertical cliff. It leaves the edge of the cliff with an initial velocity of 15 m/s directed at 25° from the vertical and experiences no appreciable air resistance as it travels. How high is the cliff?
Fill in the blank(s) with the appropriate word(s).
The inductance of a solenoid 16.0 cm long with a cross-sectional area of 1.00 × 10-4 m2 is 1.00 mH. How many turns of wire does this solenoid have?
A) 318,000 B) 159,000 C) 1130 D) 282 E) 150