A mass 1 = 0.2 kg is tied with an ideal massless cord to another mass 2 = 1kg over a frictionless pulley as shown in the figure. The static and kinetic friction coefficients between the horizontal table and 2 are equal with value = 0.3. Initially, the system is at rest. A force |⃗| = 5√2 is applied to 2 with angle α = cos−1(1 5√2), as shown in the figure. ( = 10 /2). (a) What is the work done on the system by F when 2 moves by 1 meter?

(b) What is the work done on the system by friction for the same motion?

(c) What is the velocity (both direction and magnitude) of 1 after 2 has moved by 1 meter?

Acar moves at 12m/s and coasts up a hill with a uniform acceleration of -1.6m/s2. how far has it traveled after 6.0s?

The human body stores chemical energy from digested food. some of the chemical energy is converted into mechanical energy when the body moves. which statement best supported by this information

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.