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Luda [366]
3 years ago
12

A boy walks towards a stationary plane mirror at a speed of 12ms^1 what is the relative speed of approach of the boy and his ima

ge? (a)zero (b)1.2ms^-1 (c) 2.4ms^-1 (d)1.44ms^-1​
Physics
1 answer:
Vitek1552 [10]3 years ago
3 0

Answer:

a

Explanation:

mark me as brainlist ez

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17. A 25 kg block is initially at rest on a rough, horizontal surface. A horizontal force of 75 N is required to set
lapo4ka [179]

Answer:

0.30581

0.24464

Explanation:

\mu_s = Coefficient of static friction

\mu_k = Coefficient of kinetic friction

F_f = 75 N

F_k = 60 N

Normal force

F_n=mg\\\Rightarrow F_n=25\times 9.81\\\Rightarrow F_n=245.25\ N

Frictional force

F_f=\mu_sF_n\\\Rightarrow \mu_s=\frac{F_f}{F_n}\\\Rightarrow \mu_s=\frac{75}{245.25}\\\Rightarrow \mu_s=0.30581

The coefficient of static friction is 0.30581

Kinetic force

F_k=\mu_kF_n\\\Rightarrow \mu_k=\frac{F_k}{F_n}\\\Rightarrow \mu_s=\frac{60}{245.25}\\\Rightarrow \mu_s=0.24464

The coefficient of kinetic friction is 0.24464

4 0
3 years ago
What happens when an ice cube melts in a glass of water?
Aleksandr [31]

Answer:

C

Explanation:

Heat travels from hot to cold.

So that would be C

7 0
3 years ago
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What two substances make the backbone of the DNA molecule? 20 points! Will give brainliest
Elza [17]
<span>Deoxyribose is the substances along with sugar and phosphates . The rungs of the ladder are made up of 5 nitrogenous bases adenine, thymine, cytosine, and guanine. 
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8 0
3 years ago
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An object travelling at 12 m/s has 64.8j of stored kinetic energy. What is the mass of the object, in grams?​
bekas [8.4K]

Answer:

So u divided 12 divided by 64.8 okay

Explanation:

and when I getc the answer that's urs answer

4 0
3 years ago
An 85 kg object is moving at a constant speed of 15 m/s in a circular path,which has a radius of 20 meters. What centripetal for
vova2212 [387]
As always,. F = M A. Centripetal acceleration = V-squared / R. So F=M V-squared/R. =. 85 x 225 / 20. = 956.25 Newton's (about 215 pounds). That's the force required to keep that mass moving at that speed around that circle. If the force is less, or not there, then the 85 kg moves slower, or leaves that path.
7 0
3 years ago
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