Answer:
400watts
Explanation:
Power is defined as the amount of energy expended in a specific time. It is also defined as the change in work done with respect to time.
Mathematically,
Power = Workdone/time
Work done = Force×distance
Power = Force × Distance/Time
Given force = mass× acceleration due to gravity
Force = 60×10 = 600N
Distance covered = 4.0m
Time taken = 6.0seconds
Power expended = 600×4/6
Power expended = 400Watts
The average mechanical power (in W) required to do this is 400Watts
m = mass of the object lifted by you = 14 kg
g = acceleration due to gravity by earth on the object being lifted = 9.8 m/s²
h = height to which the object is lifted slowly = 0.80 m
W = Work done in lifting the object
work done in lifting the object is same as the gravitational potential energy gained by the object. hence
Work done = Gravitation potential energy of object
W = m g h
inserting the values
W = (14) (9.8) (0.80)
W = 109.8 J
work done = force * distance moved (in direction of the force)
force= mass* acceleration
force=58.1N
58.1*(5.8*10^4)
=3,369,800 J
D. because Land does reach higher temperatures then water and Land heats more rapidly
Answer:
Sound waves need to travel through a medium such as solids, liquids and gases. The sound waves move through each of these mediums by vibrating the molecules in the matter. The molecules in solids are packed very tightly. ... Sound travels about four times faster and farther in water than it does in air