PLEASE HELP ME WITH THIS PHYSICS QUIZ THERES A TIME LIMIT

Question 19 A stone is dropped from the top of a cliff. As it falls the kinetic energy the gravitational potential Not yet answered energy and the mechanical energy Marked out of 1.00 Assume that air friction acts on the stone. Select the best response that completes each blank. Flag questionQuestion 20 Use the following diagram to answer this question: Not yet answered Marked out of 1.00 Flag question The mass, m, can vibrate on this spring with simple harmonic motion. If the mass on the end of the spring INCREASES, which of the following experimental observations would you observe? Select one: O a. The period of vibration would decrease. O b. The frequency of the vibration would decrease. O c. The frequency of the vibration would increase. O d. The frequency and period would be unchanged.Question 21 Consider a mass attached to a spring oscillating horizontally in simple harmonic motion (SHM). Not yet answered The magnitude of the acceleration will be greatest Marked out of 1.00 The magnitude of the restoring force will be greatest Flag question The magnitude of the velocity will be greatestThe magnitude of the acceleration will be greates at its rest position The magnitude of the restoring force will be great at its maximum displacement between the rest position and maximum displacement The magnitude of the velocity will be greatestQuestion 22 The difference between longitudinal vs transverse waves is that: Not yet answered Select one: Marked out of 1.00 O a. Longitudinal waves have vibrations parallel to the direction of travel. Flag O b. Transverse waves transmit more energy through a medium. question O c. Longitudinal waves transmit more energy through a medium. O d. Transverse waves have vibrations parallel to the direction of travel. Question 23 The safe speed for a car driving through a curve is at a maximum when the road is dry. Not yet answered How does the maximum safe speed change if the road is icy and the coefficient of friction is reduced to one quarter of Marked out of the original coefficient? 1.00 Select one: Flag question O a. The maximum safe speed goes down to 25% of the original speed. O b. Not enough information is provided to answer this problem. O c. The maximum safe speed goes down to 75% of the original speed. O d. The maximum safe speed goes down to 50% of the original speed.Question 24 A car accelerates uniformly from rest to a speed of 34.9 m/s over a distance of 10.4 m. Time left 2:57:12 Not yet answered Calculate the time (in SECONDS) it takes for the car to accelerate as described above. Marked out of Answer rounded to two decimal places. 1.00 Flag question Answer: Question 25 A Lunar Landing Research Vehicle (LLRV) has a weight of 10.9 kN on Earth. On Saturn, the LLRV's weight changes to Not yet 12.4 kN. answered Marked out of Use the data above to calculate the gravitational field strength on Saturn. 1.00 Answer in units of N/kg, round to 1 decimal place. Flag