PHY 250 Graded Exam 3rd2:The gravitational force between two objects has a magnitude of...

The gravitational force between two objects has a magnitude of F. If both masses were doubled and the distance between them doubled, the new force would have which of the following magnitudes? Select one: a. b. c. F d. 2F A certain galaxy is receding from observers on Earth at a speed of 0.94c. Within that galaxy, a star explodes, sending hot gases back towards the Earth. Relative to the galaxy, these gases travel at a speed of 0.67c. What is the speed of the gases relative to Earth? Select one: a. 0.99c b. 0.73c c. 0.27c d. 0.17c A dolphin trailing one of the Navy’s aircraft carriers decides swim underneath the carrier. Does the presence of the ship affect the pressure changes the dolphin feels as it dives? Select one: a. Yes, the pressure increases because of the weight of the ship. b. Yes, the pressure decreases because less water is above the fish. c. No, the pressure remains the same as when the ship wasn’t there. d. It is uncertain, because the pressure depends upon the length and width of the ship.