A student is sitting in a moving car. Through the car's window, the student sees a traffic light at an intersection pass by and out of sight as the car travels down the road.
Which statement accurately describes the student's motion?
• The student is moving relative to the car’s window but not to the traffic light.
• The student is moving relative to the traffic light but not to the car’s window.
• The student is moving relative to both the car’s window and traffic light.
• The student is moving relative to neither the car’s window nor the traffic light.

Multiply or divide to make this english distance conversion. 174 inches = feet (14.5, 58, 2,088, 23)

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

What is the difference between mass density and weight density?