The identity of an atom is determined by its number of
a. valence bonds.
b. neutrons.
c. electrons.
d. protons.
d
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A 1-kg ball is released from a height of 6 m, and a 2-kg ball is released from a height of 3 m. Air resistance is negligible as they fall. Which of the following statements about these balls are correct? (There could be more than one correct choice)
A) As they reach the ground, the 1-kg ball will have more kinetic energy than the 2-kg ball because it was dropped from a greater height. B) As they reach the ground, the 1-kg ball will be moving faster than the 2-kg ball. C) Both balls will reach the ground with the same speed. D) Both balls will reach the ground with the same kinetic energy. E) Both balls will take the same time to reach the ground.
Calculate the radius that a loop should have so that the magnetic energy density at its center is equal to 6 mJ/ m3 when a current I = 20A passes through the loop?
A) 26 cm B) 10 cm C) 7 cm D) 18 cm E) 15 cm
A 1000-kg helicopter hovers over a forest fire and starts to squirt water downward with a speed of 10 m/s at a rate of 40 kg/s. What is the initial upward acceleration on the helicopter when it first starts to release the water?
A) 2.5 m/s2 B) 0.40 m/s2 C) 0.25 m/s2 D) 4.0 m/s2 E) 5.0 m/s2
A conducting bar slides without friction on two parallel horizontal rails that are 50 cm apart and connected by a wire at one end
The resistance of the bar and the rails is constant and equal to 0.10 ?. A uniform magnetic field is perpendicular to the plane of the rails. A 0.080-N force parallel to the rails is required to keep the bar moving at a constant speed of 0.50 m/s. What is the magnitude of the magnetic field? A) 0.10 T B) 0.25 T C) 0.36 T D) 0.54 T E) 0.93 T