Massive, more luminous stars have shorter lives than their smaller, dimmer counterparts
Indicate whether the statement is true or false
TRUE
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The planet-wide flow of air from Earth's equator to the colder poles is called Hadley circulation. An example of this effect is also seen
a. on Mars b. on Mercury c. on Venus d. nowhere else in the solar system
An unfueled 1000-kg experimental rocket sled at rest on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20 s "burn.". The rocket moves at 160 m/s after the burn. What average force is experienced by the rocket during the burn?
a. 0.80 × 10^4 N c. 0.60 × 10^4 N b. 0.75 × 10^4 N d. 0.35 × 10^4 N
An ideal solenoid having 200 turns and carrying a current of 2.0 A is 25 cm long. What is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/A)
What will be an ideal response?
A gravitationally bound universe, with omega greater than 1.0, will expand forever
Indicate whether the statement is true or false