3. Which of the following is an example of Newtons second law of motion? (2 points) O Caties skateboard hits a curb and she falls forward onto the grass.
O A tissue and a rock are dropped from a ladder. The rock exerts a greater force when it hits the ground.
A person stands on a chair and pushes down, and the chair pushes upwards on the person.
Tires from a bike push against the road, and the road pushes back.

Aspecial electronic sensor is embedded in the seat of a car that takes riders around a circular loop-the-loop ride at an amusement park. the sensor measures the magnitude of the normal force that the seat exerts on a rider. the loop-the-loop ride is in the vertical plane and its radius is 23 m. sitting on the seat before the ride starts, a rider is level and stationary, and the electronic sensor reads 740 n. at the top of the loop, the rider is upside down and moving, and the sensor reads 370 n. what is the speed of the rider at the top of the loop?

6–55 refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 358c at a rate of 0.018 kg/s and leaves at 800 kpa as a saturated liquid. if the compressor consumes 1.2 kw of power, determine (a) the cop of the heat pump and (b) the rate of heat absorption from the outside air.

What is the measure of a change in an objects velocity?