The distance from a to b is 20 cm, and the distance from a to c is 80 cm. What is the mechanical advantage of the system if effort is put on the longer arm? A. 0.25

B. 4

C. 40

D. 80

Jackson is designing a new heater, and he wants to experiment with different thermally conductive materials. which of these materials would be useful in conducting heat?

Aprojectile is launched from ground level with an initial velocity of v 0 feet per second. neglecting air resistance, its height in feet t seconds after launch is given by s equals negative 16 t squared plus v 0 t. find the time(s) that the projectile will (a) reach a height of 192 ft and (b) return to the ground when v 0equals112 feet per second. (a) find the time(s) that the projectile will reach a height of 192 ft when v 0equals112 feet per second. select the correct choice below and, if necessary, fill in the answer box to complete your choice.

Acompound machine is also called a machine. a. force b. simple c. complex d. directional