Answer to Question #275306 in Classical Mechanics for ewfhuf1

Question

A 2.6 kg block, in contact with a 90 N/m spring compressed by 2 m, is moving at 4.5 m/s along a ledge 5 m above the surface of the Earth, which is the zero reference level. What is the total energy of the block, as the system?

(a) 127.4 J (b) 180 J (c) 153.7 J (d) 333.7 J (e) 26.3 J

A 44 kg block is moving at 6.5 m/s at the bottom of a rough 22-degree incline. If the coefficient of friction on the incline is 0.16, what distance up along the incline does the block travel?

(a) 33.7 cm (b) 76.5 cm (c) 14.6 m (d) 80.8 cm (e) 145 cm

A 7.4 kg cart initially moving at 3 m/s is pushed for 1.4 m by a net force of 22 N. How fast will the cart be moving when the force stops acting?

(a) 2.9 m/s (b) 6.8 m/s (c) 7.5 m/s (d) 4.2 m/s (e) 3.9 m/s

Answer 1

1) (d) 333.7 J

2)(e) 145 cm

3) (d) 4.2 m/s