While leaning out a window that is 5.70 m above the ground, you drop a 0.600-kg basketball to a friend at ground level. your friend catches the ball at a height of 2.00 m above the ground. determine the following.
(a) the amount of work done by the force of gravity on the ball
(b) the gravitational potential energy of the ball-earth system, relative to the ground when it is released
(c) the gravitational potential energy of the ball-earth system, relative to the ground when it is caught
(d) the ratio of the change (pef − pe0) in the gravitational potential energy of the ball-earth system to the work done on the ball by the force of gravity

a)21.756 J

b)33.516 J

c)11.52 J

d)-1

Explanation:

Net fall in height of ball= 5.70-2.0= 3.70 m

a)  work done by the force of gravity on the ball = Mg*h = 0.6×9.8×3.7 = 21.756 J

b) gravitational potential energy of the ball-earth system, relative to the ground when it is released = 0.6×9.8×5.70 = 33.516 J (ans)

c) the gravitational potential energy of the ball-earth system, relative to the ground when it is caught = 0.6×9.8×2 = 11.52 J

d) ratio of the change (PE_f − PE_0) in the gravitational potential energy of the ball-earth system to the work done on the ball by the force of gravity = (11.52 -33.51)/(21.756) ≅-1 (ans)

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation:

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles