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mr_godi [17]
3 years ago
10

Question 10 of 10

Physics
1 answer:
rewona [7]3 years ago
6 0

Answer: D

Explanation:

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A steel cable lying flat on the floor drags a 20 kg block across a horizontal, frictionless floor. A 110 N force applied to the
sammy [17]

Answer:

The mass of the cable is 4.94 kg                                                                                                                                                                            

Explanation:

It is given that,

Mass of the block, m = 20 kg

Force applied to the cable, F = 110 N

Speed of the block, v = 4.2 m/s

Distance, d = 2 m

Let a is the acceleration of the block. It can be calculated using the third equation of motion as :

v^2-u^2=2ad

(4.2)^2-(0)^2=2a\times 2

a=4.41\ m/s^2

Let m' is the mass of the cable. It can be calculated using the second law of motion as :

m'=\dfrac{F}{a}-m

m=\dfrac{110\ N}{4.41\ m/s^2}-20

m = 4.94 kg

So, the mass of the cable is 4.94 kg. Hence, this is the required solution.

5 0
3 years ago
A boy held a ball in the air what force is he applying?
Delvig [45]

Answer:

strength

Explanation:

7 0
3 years ago
Read 2 more answers
When two hydrogen atoms bond, the positive nucleus of one atom attracts the
mafiozo [28]
<span>When two hydrogen atoms bond, the positive nucleus of one atom attracts the electrons of both the atoms since the electrons are shared between the two atoms now.</span>
6 0
3 years ago
In a mattress test, you drop a 7.0 kg bowling ball from a height of 1.5 m above a mattress, which as a result compresses 15 cm a
Assoli18 [71]

Answer:

(c) 10.29 J

(d) 113.19 J

(e) 113.19 J

(f) 10061 N/m

Explanation:

15 cm = 0.15 m

Let g = 9.8 m/s2

(c) The work done by gravitational force is the product of gravity force and the distance compressed

E_p = mgx = 7*9.8*0.15 = 10.29 J

(d) By using law of energy conservation with potential energy reference being 0 at the maximum compression point. As the ball falls and come to a stop at the compression point, its potential energy is transferred to elastic energy, which is the work that the mattress does on the ball:

E_p = E_e

E_e = mgh

where h = 1.5 + 0.15 = 1.65 m is the vertical distance that it falls.

E_e = 7*9.8*1.65 = 113.19 J

(e) Before the compression, the potential energy of the mattress is 0. After the compression, the potential energy is 113.19J. So it has increased by 113.19J due to the potential energy transferred from the falling ball.

(f) E_e = 113.19 = kx^2/2

k0.15^2/2 = 113.19

k = 10061 N/m

8 0
3 years ago
Read 2 more answers
If the polar ice capsmelted, how might this<br> effect the length of the day?
Inessa [10]

Answer: It will increase the length of the day

Explanation: The polar ice caps contain the solid ice particles found around the polar regions,an increased temperature is a major cause of the melting of the polar ice Caps. When the polar ice caps melt especially in huge volumes they increase the amount of water flowing into the Sea this will cause a rise in the volume of the sea.

This rise in sea level will add some weights to Earth, making the Earth to rotate slightly lower than its normal speed,a slower rotation will lead to longer days.

3 0
4 years ago
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