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Sonbull [250]
2 years ago
5

Which are descriptions of gravity on Earth? Check all that apply.

Physics
2 answers:
vlada-n [284]2 years ago
7 0
Gravitational force is a NON-CONTACT FORCE. Gravitational force acts on all bodies on the earth that have mass. The force which is exerted through weight acts on the center of gravity of the body. The force is directed towards the center of the earth. The weight of a body is the gravitational force exerted by the earth on the body.
nataly862011 [7]2 years ago
4 0

an attractive force

a noncontact force

a vertical force

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The answer is volt for this question.

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3 years ago
A fireperson is 50 m from a burning building and directs a stream of water from a fire hose at an angle of 300 above the horizon
notsponge [240]

Answer:

We can think the water stream as a solid object that is fired.

The distance between the fireperson and the building is 50m. (i consider that the position of the fireperson is our position = 0)

The angle is 30 above the horizontal. (yo wrote 300, but this has no sense because 300° implies that he is pointing to the ground).

The initial speed of the stream is 40m/s.

First, using the fact that:

x = R*cos(θ)

y = R*sin(θ)

in this case R = 40m/s and θ = 30°

We can use the above relation to find the components of the velocity:

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We want to find the time needed to the stream to hit the buildin.

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So we want that:

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Now we need to calculate the height of the stream at t = 1.44s

Second step:

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v(t) = -g*t + 20m/s.

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Now, the height at the time t = 1.44s is

p(1.44s) = -5.9m/s^2*(1.44s)^2 + 20m/s*1.44s + po

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So the height at wich the stream hits the building is 16.57 meters above the initial height of the fire hose.

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Answer:

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