QUESTION 4 3 points Save Answer While helping your friend move into her new apartment, you carry a box full of books to the third floor. If the third floor is 9.13 m above the ground level and the mass of the box is 36.9 kg, what is the work that you perform during this action? QUESTION 5 3 points Save Answer On a freezing February morning in Pittsburgh, a moving 61C Port Authority bus of mass 16,735 kg hits a stationary Toyota Prius of mass 1365 kg. After the collision, the back of the car gets stuck under the front of the bus and they keep sliding together on the icy road at a speed of 4.11 m/s. What was the initial speed of the 61C bus? QUESTION 6 3 points Save Answer A beach ball is completely submerged under sea water of mass density 1041 kg/m If the beach ball has a volume 22.4 L (1 L = 0.001 ms), what is the magnitude of the buoyant force exerted by the water on the beach ball? QUESTION 7 3 points Save Answer If a car engine could operate between the temperatures of 23.15 C and 2315 C, what would be the Carnot efficiency of such an engine? (Give your answer as a decimal. For example, if you think that the answer is 54.5% write 54.5) QUESTION 8 2 points Save Answer A violin string vibrates at a frequency of 267.4 Hz and generates waves with a speed of 345 m/s. What is the wavelength of such waves? Save All Ansv courses.ccac.edu/webapps/assessment/take/launch.jsp?course_assessment_id=_343663_1&course_id=_69332_1&content_id=_9831598_1&i... 2/5