A cart loaded with bricks has a total mass of 12.7 kg and is pulled at constant speed by
a rope. The rope is inclined at 22.5◦
above the horizontal and the cart moves 30.7 m on
a horizontal floor. The coefficient of kinetic
friction between ground and cart is 0.7
The acceleration of gravity is 9.8 m/s
2-How much work is done on the cart by the
rope?

State the below theories and give the name of the writer of the theory 1. wave theory 2. quantum theory 3. corpuscular theory 4. electromagnetic theory

Awave that is traveling fast can be said to have a high a. frequency b. speed c. wavelength d. amplitude e. period f. none of these

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above