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Ann [662]
3 years ago
15

25.

Physics
2 answers:
Anettt [7]3 years ago
6 0

Answer:

B

Explanation:

that is the most common due to the fact that you can observe what you want before you make a purchase

Paladinen [302]3 years ago
5 0

Answer:

Explanation:

b

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A 41.0 kg child is riding a playground merry-go-round that is rotating at 60.0 rev/min. What centripetal force (in N) is exerted
Tatiana [17]

Answer:505.94 N

Explanation:

Given

mass of child (m)=41 kg

N=60 rpm

\omega =\frac{2\pi N}{60}=4\pi rad/s

Radius(r)=1.25 m

and centripetal acceleration is given by m\omega ^2r

F_c=41\times (4\pi )^2\times 1.25=505.94 N

3 0
4 years ago
A 75.0-kg person is riding in a car moving at 20.0 m/s when the car runs into a bridge abutment. (a) calculate the average force
iragen [17]

(a) -1.5\cdot 10^6 N

First of all, we need to calculate the acceleration of the person, by using the following SUVAT equation:

v^2 -u ^2 = 2ad

where

v = 0 is the final velocity

u = 20.0 m/s is the initial velocity

a is the acceleration

d = 1.00 cm = 0.01 m is the displacement of the person

Solving for a,

a=\frac{v^2-u^2}{2d}=\frac{0-20.0^2}{2(0.01)}=-20000 m/s^2

And the average force on the person is given by

F=ma

with m = 75.0 kg being the mass of the person. Substituting,

F=(75)(-20000)=-1.5\cdot 10^6 N

where the negative sign means the force is opposite to the direction of motion of the person.

b) -1.0\cdot 10^5 N

In this case,

v = 0 is the final velocity

u = 20.0 m/s is the initial velocity

a is the acceleration

d  = 15.00 cm = 0.15 m is the displacement of the person with the air bag

So the acceleration is

a=\frac{v^2-u^2}{2d}=\frac{0-20.0^2}{2(0.15)}=-1333 m/s^2

So the average force on the person is

F=ma=(75)(-1333)=-1.0\cdot 10^5 N

7 0
4 years ago
Permafrost thaws only briefly in the summer. t o f brainliest
Verizon [17]
The answer is False.  Permafrost does not thaws briefly in the summer since Permafrost is all year round. As global temperature rise, the amount that frozen soil that melts is increasing.  With warmer temperature, snow and ice that used to reflect sunlight is disappearing.  Thus, the newly exposed soil absorbs heat from the sunlight, and encourages melting.
5 0
3 years ago
Which movement causes day and night on Earth?
Brilliant_brown [7]

Answer:

The rotation of Earth

5 0
3 years ago
Read 2 more answers
Suppose that a conducting sphere is charged positively by some method. The charge is initially deposited on the left side of the
Sveta_85 [38]

Answer:

electrons will migrate untill there is uniform distribution of  charge .

and sphere became uniformly charged

Explanation:

as conducting sphere is charged positively it is given . the left side of sphere is charged positively . there is negative charge on the left side that will be attracted by positive charge of right side .

therefore electrons from left side will start migrate towards right side due to attraction of positive charge of right side .

therefore electron will start migrate uniformly .

electrons will migrate untill there is uniform distribution of  charge .

and sphere became uniformly charged

3 0
4 years ago
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