What force must be applied to roll a 120 pound barrel up an inclined plane 9 feet long to a height of 3 feet (disregard friction)? L➗I=R ➗E L = length of ramp, measured along the slope I = height of ramp R =weight of object to be raised or lowered. E = Force required to raise or lower object

PHYSICS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	40 pounds
B	120 pounds
C	360 pounds
D	None of the above

Explanation:

Detailed explanation-1: -We must exert a force of 40 pounds to roll a 120-pound barrel up the 9-foot inclined plane to lift it 3 feet.

Detailed explanation-2: -If 120 pounds of force is needed to hold back a weight as it is lowered for 3 feet, 360 foot-pounds of work has been done.

Detailed explanation-3: -Designed as small airfoils, winglets reduce the aerodynamic drag associated with vortices that develop at the wingtips as the airplane moves through the air. By reducing wingtip drag, fuel consumption goes down and range is extended.

Detailed explanation-4: -If the volume of a confined gas is doubled (without the addition of more gas), the pressure will (assume the temperature remains constant). be reduced to one-half its original value. If the temperature of a confined liquid is held constant and its pressure is tripled, the volume will? remain the same.

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GENERAL KNOWLEDGE

GK

PHYSICS