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Karolina [17]
3 years ago
11

A 4kg block slides freely across a rough surface such that the block slows down with an acceleration of −1.25 m/s2 . What is the

coefficient of kinetic friction between the block and the surface?
Physics
1 answer:
Sophie [7]3 years ago
6 0

Answer:

The coefficient of kinetic friction between the block and the surface is 0.127.

Explanation:

Given that,

The mass of a block, m = 4 kg

The acceleration of the block, a = -1.25 m/s²

We need to find the coefficient of kinetic friction between the block and the surface. The force of friction is given by :

F=\mu mg\\\\ma=\mu mg\\\\\mu=\dfrac{a}{g}\\\\\mu=\dfrac{1.25}{9.8}\\\\\mu=0.127

So, the coefficient of kinetic friction between the block and the surface is 0.127.

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Charged particles q1=− 4.80 nC and q2=+ 4.80 nC are separated by distance 3.00 mm , forming an electric dipole. The charges are
Dafna1 [17]

Answer:

Electric field, E = 936.19 N/C

Explanation:

It is given that,

Charge 1, q_1=-4.8\ nC=-4.8\times 10^{-9}\ C

Charge 2, q_2=+4.8\ nC=+4.8\times 10^{-9}\ C

Distance between them, d = 3 mm = 0.003 m

Torque, \tau=8\times 10^{-9}\ N-m

Angle between electric field and line connecting the charge, \theta=36.4^{\circ}

We need to find the torque exerted on the dipole. The torque experienced by the dipole in the electric field is given by :

\tau=pE\ sin\theta

p is the dipole moment, p=qd

\tau=qdE\ sin\theta

E=\dfrac{\tau}{qd\ sin\theta}

E=\dfrac{8\times 10^{-9}}{4.8\times 10^{-9}\times 0.003\ sin(36.4)}

E = 936.19 N/C

So, the magnitude of electric field on the dipole is 936.19 N/C. Hence, this is the required solution.

5 0
3 years ago
what is the average acceleration of a car if a car rest from 0m/s and reaches a final velocity is 50m/s in 10m/s
GuDViN [60]

Answer:

Assuming that you meant the final velocity of 50 m/s was reached in 10 s, the answer would be 5 m/s^2.

Explanation:

V_{f} = V_{i} + at

So we update that with the values that we have.

50 = 0 +a(10)

then simplify that using algebra to solve for a and we get 5 m/s^2

6 0
3 years ago
2
kakasveta [241]

Answer:

A

Explanation:

As the interest rate goes up, your payments and the total repayment amount could increase. On the other hand, if the interest rate happens to drop, you may save money overall and pay less.

4 0
4 years ago
A horizontal spring required a force of 1.0 N to compress it 0.1 m. How much work is required to stretch the spring 0.4 m?
Crank

Answer:

<h2>0.5J</h2>

Explanation:

given data

Force applied F= 1N

extension e= 0.1m

let us find the spring constant first

applying

F=ke

k=F/e

k=1/0.1

k=10N/m

Step two:

Required is the work done

we know that the expression/formula for the work done by a spring is given as

Wd=1/2kx^2

x=0.4m

substitute

Wd= 1/2*10*0.4^2

Wd=0.5*10*0.16

Wd=0.5J

3 0
3 years ago
How to convert 45.77 cubic inches to cubic centimeters
Paha777 [63]
45✖️77 and then you will get your answer
6 0
3 years ago
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