3 years ago

Hot air balloon ( look at pic)

Physics

1 answer:

kramer3 years ago

6 0

Answer:

I think that the answer is convection.

Explanation:

Hope this helps.

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What happens to the velocity of an object when balanced force acts on it?

Pani-rosa [81]

When the entire group of forces acting on an object is balanced,
the individual forces all add up to zero, and the effect on the object
is the same as it would be if there were no force at all acting on it.

No force on it means no acceleration ... no change in speed or
direction of motion.

No change in speed or direction of motion means constant velocity.

8 0

4 years ago

Person is lifting a 250 N dumbbell. The weight is 30 cm from the pivot point of the elbow. What force must be exerted five from

qwelly [4]

Refer to the diagram shown below.

The force, F, is applied at 5 cm from the elbow.

For dynamic equilibrium, the sum of moments about the elbow is zero.
Take moments about the elbow.
(5 cm)*(F N) - (30 cm)*(250 N) = 0
F = (30*250)/5 = 1500 N

Answer: 1500 N