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chubhunter [2.5K]
3 years ago
12

A dog is standing in the bed of a pickup truck. The bed is coated with ice, causing the force of friction between the dog and th

e truck to be zero. The truck is initially at rest, and then accelerates to the right, moving along a flat road. As seen from a stationary observer (watching the truck move to the right), the dog:
A. moves to the right at the same rate as the truck, so it doesn't slide.
B. does not move left or right, but the back of the truck moves towards the dog.
C. moves to the right, but not as quickly as the truck is moving to the right, causing it to slide towards the back of the truck.
D. moves to the left, as the truck moves to the right, causing the dog to slide towards the back of the truck.
Physics
1 answer:
Lady bird [3.3K]3 years ago
8 0

Answer:

Explanation:

As the truck is moving towards right and there is no friction between the truck and dog, it experiences a psheudo force, so the dog moves towards left.

Option (D)

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Answer:

Block A will have a final charge of 3.5nC.

Explanation:

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This process is called Charging by Conduction.

This charging process will continue until the charges are evenly distributed between both objects.

In case you're wondering, "<em>how's all this possible within a few seconds</em>?", remember that electrons travel very fast and so, this process is a rather rapid one.

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The goalkeeper at his goal cannot kick a soccer ball into the opponent’s goal without the ball touching the ground

Explanation:

Consider the vertical motion of ball,

We have equation of motion v = u + at

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This is the time of flight.

Consider the horizontal motion of ball,

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        Time, t=\frac{usin\theta }{g}  

     Substituting

                      s = ut + 0.5 at²

                      s=ucos\theta \times \frac{usin\theta }{g}+0.5\times 0\times (\frac{usin\theta }{g})^2\\\\s=\frac{u^2sin\theta cos\theta}{g}\\\\s=\frac{u^2sin2\theta}{2g}

This is the range.

In this problem

              u = 30 m/s

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              θ = 45° - For maximum range

Substituting

               s=\frac{30^2\times sin(2\times 45)}{2\times 9.81}=45.87m

Maximum horizontal distance traveled by ball without touching ground is 45.87 m, which is less than 95 m.

So the goalkeeper at his goal cannot kick a soccer ball into the opponent’s goal without the ball touching the ground

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Explanation:

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