the pitch of a screw Jack 5mm and the length of Tommy bar is 50cm. An effort is applied on the screw through a height of 20cm to raise a load of 4000N. if the Efficiency is 60% Calculate the velocity ratio, Mechanical advantage, Effort applied, work input into the machine ​

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to:

Blood pressure the total amount of blood the heart pumps in one minute 2. cardiac output the number of times your heart beats in a minute 3. dilate the amount of blood that the heart can pump in a single beat 4. heart rate the force exerted on the walls of the blood vessels by the blood that moves through them 5. stroke volume to widen or get larger in size

What is an electric motor? explain its operation. 2-3 sentence