Answer:
Zero because the applied force is perpendicular to the motion of the object.
No work is done on an object moving is a circular path about a central attractive force.
Any work done in such a case would result in a change in the orbit.
Answer:
Explanation:
There are 3 main forces at work here, gravity, normal and friction. The gravity pulls the car straight down and is what keeps the car on the ground. Normal force is straight up from the points where the car is touching, so since the wheels are the only parts of the car touching the street, this is where all the normal force is. Friction force opposes any and all motion, the car wants to slide down the hill and would slide down the hill if there was no friction, so the friction force is in the opposite direction of the cars intended motion.
Answer:
A remote controlled (<em>or externally piloted) </em>sequence valve
Explanation:
First of all, a sequence valve is a pressure-operated valve that opens at an adjustable set pressure.
Sequence valves can be internally piloted or externally piloted.
- Internally piloted sequence valves are known as direct-acting sequence valve. This means that the pressure change they sense is from their main inlet valve.
- Externally piloted sequence valves have a pilot line in which the pilot signal to open the valve is from a source other than the line feeding it.
External pilot-operated sequence valves can be used to open and allow flow when a remote operation reaches a certain predetermined pressure.
Answer:
heat and power
Explanation:
is the simultaneous production of electricity and heat both of which are used
