A tuning fork vibrates at a frequency of 570 Hz and is held in the air above an open tube at both ends. The first resonance occurs when the tube length is 29 cm. Caucule the speed of sound in the air.

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)