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NemiM [27]
3 years ago
7

A car travels at a constant speed of 40 miles per hour down the street for around 0.25 hours. What is its acceleration?

Physics
2 answers:
prohojiy [21]3 years ago
6 0

Answer:

55

Explanation:

was moving at 25 miles per hour

forsale [732]3 years ago
5 0
It’s acceleration is 0 if it was traveling at a constant speed
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What has more energy a 2 kg mass at 10 m/s or a 2 kg mass 5 m above the ground
Alexxandr [17]

Answer:

Both have same energy

Explanation:

Given:

Sample 1

Mass m = 2 kg

Velocity v = 10 m/s

Sample 2

Mass m = 2 kg

Height h = 5 m

Assume g = 10 m/s²

Find:

What has more energy

Computation:

In sample 1

Ke = 1/2(m)(v)²

Ke = 1/2(2)(10)²

Ke = 100 joule

In sample 2

Pe = mgh

Pe = (2)(10)(5)

Pe = 100  joules

Both have same energy

7 0
3 years ago
An acrobatic airplane performs a loop at an airshow. The centripetal acceleration the plane experiences is 14.7 m/s2.  If it tak
Ivahew [28]

Answer:

754.8 m

Explanation:

The centripetal acceleration is given by

a=\frac{v^2}{r}

where v is the speed of the airplane and r is the radius of the loop.

We can rewrite the speed of the airplane as the ratio between the length of the circumference (2 \pi r) and the time taken:

v=\frac{2 \pi r}{t}

Substituting in the formula of the acceleration, we have

a=\frac{(2 \pi)^2 r^2}{t^2 r}=\frac{(2 \pi)^2 r}{t^2}

Re-arranging the formula and putting the numbers of the problem into it, we can find the radius of the loop, r:

r=\frac{at^2}{(2 \pi)^2}=\frac{(14.7 m/s^2)(45.0 s)^2}{(2 \pi)^2}=754.8 m

4 0
3 years ago
Read 2 more answers
What is the formula for acceleration? ( PLEASE HELP! ALSO IF YOU GET B IT'S WRONG BECAUSE I ALREADY PUT THAT AND IT WAS WRONG so
skad [1K]

Answer:

option A is correct

Explanation:

acceleration the time rate of change of velocity or speed so

a=Δv/t

Δv=vf-vi  

Δv= final speed-initial speed

now a=final speed-initial speed/time

3 0
4 years ago
A hammer is used to hit a nail into a board. Which statement is correct about the forces at play between the nail and the hammer
emmasim [6.3K]

Answer:

Hewo My Lovelys!!

Answer is down below!!

Explanation:

The answer is C) The nail exerts an equal force on the hammer in the opposite direction.

Reason: The Newtons third law states that there is an equal an opposite reaction for every action. When hammer pushes the nail, the nail will push the hammer back in opposite direction. When the hammer hits a nail then nail will exert the equal and opposite force to the hammer. These both objects will exert force on each other in opposite directions.

Hope this helps!! =3

Have a great day, evening, of night!! <3

~ XxGhostMosskitxX

5 0
3 years ago
Read 2 more answers
If the magnitude of a positive charge is tripled, what is the ratio of the original value of the electric field at a point to th
dybincka [34]

Answer:

Here is the complete question.

If the magnitude of  a positive charge is tripled, what is the ratio of the original value of the electric field at a point to the new value of the electric field at that same point.

a) 1:2

b) 1:3

c)1:6

d)1:9

b) 1:3 is the correct option.

Explanation:

7 0
3 years ago
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