Explanation :
When a ball is tossed from an upper storey window off a building, the height of the object as a function of time is given by :
Here, u = 8 m/s
The ball strikes at an angle of 20 degrees below the horizontal. We need to find the time taken by the ball to reach a point 10 meters below the level of launching such that, h (t) = 10 m and a = g = 9.8
After solving the above equation, t = 0.855 seconds
So, the ball will take 0.855 seconds to reach a point 10 m below the level of launching. Hence, this is the required solution.
Answer:
87000 J ;
200 J
Explanation:
Workdone = mgh
Weight = mg = 290kN = 290 * 1000=290000 N
h = distance = 30 cm = 0.3 m
Workdone = 290000 * 0.3
Workdone = 87000 J
B.)
Workdone = Force * distance
Force = 4000 N
Distance, d = 5 cm = 0.05 m
Workdone by the woman, W = 4000N * 0.05m
W = 200Nm = 200 J
Answer:
Only about 12%–30% of the energy from the fuel you put in a conventional vehicle is used to move it down the road, depending on the drive cycle.
Explanation:
A. When new evidence that challenges old ideas is presented.
Think about the other choices, they do not make any sense. You cannot change your ideas just because people want something to be a certain way. And you have to change your idea if you're proven wrong.
Answer:
b
Explanation: because it wont effect the animals home