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quester [9]
3 years ago
13

The distance covered by a car moving with a speed of 36 km/h in 20 minutes is

Physics
1 answer:
Hunter-Best [27]3 years ago
5 0

Answer:

D=12000m

Explanation:

Distance

Speed=distance/time

Where, speed is given in m/s

Time is given in s

Distance is given in m

Data

S=36km/h

T=20minutes

D=?

D=S*T

D=(36*1000m)/3600s*(20*60s)

D=36000m/3600s*1200s

D=10m/s*1200s

D=12000m

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Answer: -49m/s.

Explanation:

As the rock only falls, we will assume that the initial vertical velocity is zero.

We neglect the air friction, so the only force acting on the rock is the gravitational force, this means that the acceleration is -g = -9.8m/s^2.

Then we can write:

a(t) = -9.8m/s^2

To write the velocity of the rock, we must ingrate over time and get:

v(t) = (-9.8m/s^2)*t + v0

where v0 is the initial vertical velocity, and as we said above, v0 = 0m/s

Then the vertical velocity as a function of time is:

v(t) = (-9.8m/s^2)*t

Now, the question is:

"...If a rock falls for 5 seconds near the surface of the earth and with no air friction, it will reach a velocity of..."

Then we need to evaluate the velocity equation in t = 5 seconds.

v(5s) = (-9.8m/s^2)*5s = -49m/s.

3 0
3 years ago
You are hiking in Yellowstone National Park. A park ranger is speaking to students visiting a hot spring. Temperatures there can
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I’m pretty sure it’s C Archaebacteria
3 0
3 years ago
How dangerous or painful is the recoil of a shotgun?
skelet666 [1.2K]

Answer:

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3 0
3 years ago
the mass of earth is 5.972 * 1024 kg, and the radius of earth is 6,371 km. a 750 kg satellite orbits 35,800 km above earth in a
adelina 88 [10]

The speed or the tangential velocity of the satellite to keep it in its orbit is  3,073.5 meters per second.

The gravitational force between two objects is given by:

F = GMm/r²

Where:

G = constant of gravity = 6.674 x 10⁻¹¹ N.m²/kg²

M, m = mass of each object

r = distance between objects

Parameters given in the problem:

M = 5.972 x 10²⁴ kg

m = 750 kg

r = 6371 + 35,800 = 42,171 km = 42,171,000 m

Hence,

F = 6.674 x 10⁻¹¹ x 5.972 x 10²⁴ x 750 / 42,171,000²

   = 168.1 N

This is equal to centripetal force:

F = m  . v² / r

168.1  = 750 .  v² /  42,171,000

v² = 9,446,304

v = 3,073.5 m/s

Hence, the tangential velocity of the satellite to keep it in its orbit is  3,073.5 m/s

Learn more about gravitational force here:

brainly.com/question/23504494

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5 0
1 year ago
Please help!
mariarad [96]

It's hard to tell how the choices are laid out, and they have no labels.

The parallel circuits are the two circuits in your second picture.

One of them is the one with 3 switches, 2 batteries, and 2 light bulbs.

The other one is in the same picture. It's the one where all the circuit components ... the battery and 3 resistors ... are in the 4 vertical lines.

4 0
4 years ago
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