If a ball is tossed straight up into the air, at what position is its potential energy the greatest?A.when it reaches the top of its flight
B.when it first leaves your hand
C.when it approaches the top of its flight
D.when it begins to fall back to your hand.
Please Help
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Answers
Answer:
A.when it reaches the top of its flight
Explanation:
The potential energy of an object is given by:
where
m is the mass of the object
g is the acceleration of gravity
h is the heigth at which the object is located above the ground
Therefore, we see that the higher the object, the larger its potential energy: this means that the ball will have the greatest potential energy at the top of its trajectory.
potential energy increases as the height of the object does, and the highest point of a ball's flight is when it reaches the top.
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Answers
Answer:
2019?
Explanation:
Answer:
6.7 N
Explanation:
The force exerted by the 4.0 kg block on the 5.0 kg block will be 6.7
Fnet = 16 N (since it is applied only to the 3.0 kg block)
Total mass of the system, m = 3.0 kg + 4.0 kg + 5.0 kg = 12.0 kg
Fnet = ma16 = 12aSolving for a,a = 16/12 = 4/3 m/s²
m is the mass of the 5.0 kg block and a is the acceleration of the system.F = 5.0 kg x 4/3 m/s² = 6.666 N
Therefore, the force exerted by the 4.0 kg block on the 5.0 kg block is 6.7 N.
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Here's the part you need to know:
(Weight of anything) =
(the thing's mass)
times
(acceleration of gravity in the place where the thing is) .
Weight = (mass ) x (gravity) .
That's always true everywhere.
You should memorize it.
For the astronaut on Saturn . . .
Weight = (mass ) x (gravity) .
Weight = (68 kg) x (10.44 m/s²)
= 709.92 newtons .
__________________________________
On Earth, gravity is only 9.8 m/s².
So as long as the astronaut is on Earth, his weight is only
(68 kg) x (9.8 m/s²)
= 666.4 newtons .
Notice that his mass is his mass ... it doesn't change
no matter where he goes.
But his weight changes in different places, because
it depends on the gravity in each place.
Please answer this asap!
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P = mg / A
Where: P = pressure
mg = mass * gravity = W = 10.5 N
A = l*w
Solving for A (maximum):
A = 8*3
A = 24 sq. cm
Solving for A (minimum):
A = 15*8
A = 120 sq. cm
Substituting into the first equation:
Pmax = 10.5 N / 24 sq.cm
Pmax = 0.4375 Pa
Pmin = 10.5 N / 120 sq.cm
Pmin = 0.0875 Pa