A clown at the circus blows up a balloon with helium. This balloon will not float to the ceiling unless
A. the pressure of the helium inside the balloon is less than the atmospheric pressure.
B. the balloon and the helium it contains weigh less than the air displaced by the balloon.
C. the pressure of the helium inside the balloon is greater than the atmospheric pressure.
D. the weight of the balloon is less than the weight of the air displaced by the balloon.
Answer: B
You might also like to view...
Why couldn't life have originated on the Moon or Mercury?
What will be an ideal response?
What is an atom made of?
A.) Photons and electrons. B.) Photons, gravitons, and strange quarks. C.) Protons, neutrons, and electrons. D.) Positrons and electrons. E.) Neutrons, photons, and W bosons.
Three long, straight, parallel wires all lie in the yz plane and each carries a current of 20 A in the positive z direction. The two outer wires are each 4.0 cm from the center wire. What is the magnitude of the magnetic force on a 50-cm length of either of the outer wires?
a. 1.0 mN b. 0.50 mN c. 1.1 mN d. 1.5 mN e. 2.0 mN
What happens to the charge that leaves a battery in a complete circuit that includes a light bulb?
a. It goes to the light bulb and gets used up. b. It goes through the light bulb and returns to the other end of the battery. c. It accumulates at the farthest point from the bulb. d. It is lost as heat and light. e. It goes to the light bulb or other object and disperses throughout the system.