All categories

3 years ago

Now, consider whether the following statements are true or false:_____________________________________.

Physics

1 answer:

Igoryamba3 years ago

7 0

Answer:

A)F

B)F

C)T

Explanation:

This is not always true that the product of the two vector's always non-negative .It may be positive or negative.

That is why this statement is false.

The unit vectors in three perpendicular direction is i ,j and k.

We know that for unit vectors

i.i=j.j=k.k= 1

i .j= j.k=k.i=0

Therefore only parallel component of the force will contribute in the integral part instead of perpendicular component of the force.

That is why this statement is false.

This statement is True.

A)F

B)F

C)T

You might be interested in

2. What is the mass of an object if it accelerates at 3 m/s2 and has a force of 1 N?

Dvinal [7]

Answer:

hey what is this 2 in between the question

please tell

3 0

2 years ago

f you were trying to build a soundproof room, which of the following materials would you choose in order to absorb the most soun

musickatia [10]

If you don't have the coefficient of absorption, I would say Heavy curtains.

Hope this helps :)

5 0

3 years ago

Which of the following is NOT a layer of the Sun?

Alja [10]

It depends when you look at a pichture it could possibly help.

3 0

3 years ago

Under the influence of its drive force, a snowmobile is moving at a constant velocity along a horizontal patch of snow. When the

balandron [24]

Answer:

a) Δx = 11.6 m

b) t = 3.9 s

Explanation:

Since the snowmobile is moving at constant speed, and the drive force is 195 N, this means that thereis another force equal and opposite acting on it, according to Newton's 2nd Law, due to there is no acceleration present in the horizontal direction .
This force is just the force of kinetic friction, and is equal to -195 N (assuming the positive direction as the direction of the movement).
Once the drive force is shut off, the only force acting on the snowmobile remains the friction force.
According Newton's 2nd Law, this force is causing a negative acceleration (actually slowing down the snowmobile) that can be found as follows:

$a = \frac{F_{fr} }{m} = \frac{-195N}{128kg} = -1.5 m/s2 (1)$

Assuming the friction force keeps constant, we can use the following kinematic equation in order to find the distance traveled under this acceleration before coming to an stop, as follows:

$v_{f} ^{2} -v_{o} ^{2} = 2* a* \Delta x (2)$

Taking into account that vf=0, replacing by the given (v₀) and a from (1), we can solve for Δx, as follows:

$\Delta x =- \frac{v_{o}^{2}}{2*a} =- \frac{(5.90m/s)^{2}}{2*(-1.5m/s2)} = 11.6 m (3)$

We can find the time needed to come to an stop, applying the definition of acceleration, as follows:

$v_{f} = v_{o} + a*\Delta t (4)$

Since we have already said that the snowmobile comes to an stop, this means that vf = 0.
Replacing a and v₀ as we did in (3), we can solve for Δt as follows:

$\Delta t = \frac{-v_{o} }{a} = \frac{-5.9m/s}{-1.5m/s2} = 3.9 s (5)$

7 0

2 years ago

What is the theory of light?

Lostsunrise [7]

Answer:

Corpuscular theory of light

Explanation:

In optics, the corpuscular theory of light, arguably set forward by Descartes in 1637, states that light is made up of small discrete particles called "corpuscles" which travel in a straight line with a finite velocity and possess impetus. This was based on an alternate description of atomism of the time period.

3 0

3 years ago