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harina [27]
3 years ago
12

A 700-kg car, driving at 29 m/s, hits a brick wall and rebounds with a speed of 4.5 m/s. If the car was in contact with the wall

for 0.30 s, what force did the wall exert on the car during the collision?
Physics
1 answer:
Alinara [238K]3 years ago
6 0

Answer:

<h2>57166.6N</h2>

Explanation:

Step one:

given data

mass=700kg

initial velocity u=29m/s

final velocity=4.5m/s

time t= 0.3second.

Step two:

The expression for the momentum is given as

FΔt=mΔv

make F subject of the formula

F=mΔv/Δt

Substitute our given data we have

F=700(29-4.5)/0.3

F=700*24.5/0.3

F=17150/0.3

F=57166.6N

the force is 57166.6N

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Based on all we know about the terrestrial worlds, what single factor appears to play the most important role in a terrestrial p
Archy [21]

Based on all we know about the terrestrial worlds, the  single factor appears to play the most important role in a terrestrial planet's geological destiny is size size of terrestrial planet .

According to the question

Terrestrial Planets:

They belongs to a class of planets that are like the earth

Geological destiny :

Geology is biological destiny: Whatever minerals land or are deposited in a place determine what or who can make a living there millions of years later

Based on all we know about the terrestrial worlds, what single factor appears to play the most important role in a terrestrial planet's geological destiny

i.e

The size of terrestrial planet is one of the factors to play the most important role in a terrestrial planet's geological destiny  

which determines how long the planet can retain internal heat, which drives geological activity because  Smaller worlds cool off faster and harden earlier .

Hence, Based on all we know about the terrestrial worlds, the  single factor appears to play the most important role in a terrestrial planet's geological destiny is size size of terrestrial planet .

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6 0
2 years ago
How much work is accomplished when a force of 300N pushes a box across the floor for a distance of 100 meters?
Nesterboy [21]

So the correct ans is B.

hope it helps u.

5 0
4 years ago
Read 2 more answers
Please help me on this
Dafna1 [17]
I’m pretty sure the answer is A
5 0
3 years ago
If the answer to your calculation has units of kg.m^2/s^2. What type of quantity could it be?
Juliette [100K]

The quantity can be work or kinetic energy or potential energy. Work is same as the energy.

Work done can be described as energy transferred from and object when a force is applied along a displacement. That is work done is the product of force in the direction of the displacement and the magnitude of the displacement.

Mathematically it can be represented as,

W = F x d

where,

W ⇒ work done

F ⇒ force acting along the displacement

d ⇒ magnitude of displacement

We know,

force = mass x acceleration

∴ the unit of force is kgms⁻²

The unit of work done will be kgms⁻² x m

That is kgm²s⁻²

where m is the unit of displacement that is meter (m)

Hence kgm²s⁻² is the unit for work or energy

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6 0
2 years ago
Suppose you wanted to be able to see astronauts on the moon. what is the smallest diameter of the objective lens required to res
joja [24]

r = distance of moon from earth = 3.84 x 10⁸ m

R = size of the object on moon = 0.67 m

D = diameter of the lens = ?

\lambda = wavelength of light = 550 x 10⁻⁹ m

Using the equation for Rayleigh criterion

R/r = 1.22 \lambda/D

inserting the values

0.67/(3.84 x 10⁸) = 1.22 (550 x 10⁻⁹) /D

D = 384.6 m

4 0
3 years ago
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