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2 years ago

Which of the following examples does not illustrate Newton's first law of motion?

Physics

1 answer:

Stella [2.4K]2 years ago

6 0

Answer: B

Explanation: The rocket is accelerating the the spacecraft. Accelerating relates to Newtons Second Law of Motion.

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Two point charges, A and B, are separated by a distance of 19.0 cm . The magnitude of the charge on A is twice that of the charg

ankoles [38]

Answer:

QA = 19μC

QB = 9.5 μC

Explanation:

The force that each charge exerts on the other must obey Coulomb's Law, as follows:

$F_{AB} = \frac{k*Q_{A} * Q_{B}}{r_{AB}^{2}} (1)$

We know that the value of the magnitude of FAB is 45.0 N, the distance between QA and QB is 0.19 m, and that QA = 2*QB.
Replacing in (1), we can solve for QB, as follows:

$Q_{B} = \sqrt{\frac{F_{AB}*r_{AB} ^{2}}{2*k} } = \sqrt{\frac{45.0N*(0.19m) ^{2}}{2*9e9N*m2/C2} } = 9.5e-6 C (2)$

Since QA = 2*QB
⇒ QA = 2* 9.5μC = 19.0 μC
⇒ QB = 9.5μC

5 0

2 years ago

A jogger runs 5 km in 0.6 h, then 9 km in 0.5 hr. What is the average speed of the jogger

vesna_86 [32]

Note: The values given in the answer are rounded off to the nearest hundredth.

7 0

1 year ago

A uniform sphere (I = 2/5 MR 2 ) rolls down an incline. (a) What must be the incline angle if the linear acceleration of the cen

Liono4ka [1.6K]

Answer:

Part a)

$\theta = 8.05 degree$

Part b)

$a = 1.37 m/s^2$

Explanation:

As the uniform sphere is rolling down the inclined plane then the net force on the sphere is given as

$mg sin\theta - F_f = ma$

also we have torque equation on it

$F_f R = I\alpha$

for pure rolling

$a = R \alpha$

$F_f = \frac{Ia}{R^2}$

now we have

$mg sin\theta = ma + \frac{Ia}{R^2}$

now we have

$mg sin\theta = (m + \frac{2}{5}m)a$

$a = \frac{5}{7}g sin\theta$

now given that

$a = 0.10 g$

so we have

$0.10 g = \frac{5}{7} g sin\theta$

$sin\theta = 0.14$

$\theta = 8.05 degree$

Part b)

If the inclined plane is frictionless then the acceleration is given as

$a = g sin\theta$

$a = 9.8(0.14)$

$a = 1.37 m/s^2$

5 0

3 years ago

Read 2 more answers

Why do stars appear so steady when viewed from the surface of moon or<br> by an astronaut in space?

Nutka1998 [239]

Answer:

Explanation:

The light from these little disks is also refracted by Earth's atmosphere, as it travels toward our eyes. That's because, in the direction of any horizon, you're looking through more atmosphere than when you look overhead. If you could see stars and planets from outer space, both would shine steadily.

Answer From GauthMath If you like it then please heart it and comment thanks.

4 0

2 years ago

What force is required to accelerate a body with a mass of 15 kilograms at a rate of 8 m/s²?

lawyer [7]

I really think it could be a 23 kg

4 0

3 years ago