The diagrams show the horizontal forces acting on the cyclist at three different speeds. The length of an arrow represents the size of the force.
A
B
с
Which one of the diagrams, A, B or C, represents the forces acting when the
cyclist is travelling at a constant 9 m/s?
С
Explain the reason for your choice.

Ahollow metal sphere has 6 cm and 11 cm inner and outer radii, respectively. the surface charge density on the inside surface is −100nc/m2. the surface charge density on the exterior surface is:

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° 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.)