A double threaded right handed worm gear transmits 15 hp at 1150 rpm. The pitch of the worm is 0.75 inches and pitch diameter of 3 inches. The pressure angle is 14 1/2° and the coefficient of friction is 0.12. Find the worm gear efficiency.

The moon has much less gravitational force than earth. What would happen if you went to the moon?

Select the correct answer. An object at rest requires a force of 15 newtons to set it into motion. This force is greater than which force? OA. tension OB. gravity OC. friction D. electromagnetic E. strong nuclear force

Which of these experiments would make use of qualitative data?

A machine launches a tennis ball at an angle of 25° above the horizontal at a speed of 14 meters per second. The ball returns to level ground. Which combination of changes must produce an increase in time of flight of a second launch? A.

A constant force is applied to an object, causing the object to accelerate at 8.0 m/s2. What will the acceleration be if a. The force is doubled? b. The object's mass is doubled? c. The force and the object's mass are both doubled?

A boat is traveling upstream in the positive direction of the x axis at 10 km/h with respect to the water of a river. The water is flowing at 7 km/h with respect to the ground. (a) What is the velocity of the boat with respect to the ground?

What are the standard units of length mass volume and temperature?

Approximately how long is a light-year? A. 9.5 billion km B. 95 billion km C. 9.5 trillion km D. 95 trillion km

A car that increases its speed from 20km/h to 100km/h undergoes what acceleration

When a wave crosses a boundary and changes speed and direction?