Ask question

Ask question

All categories

anyanavicka [17]

2 years ago

6

Determine the angle between the directions of vector A with rightwards arrow on top = 3.00i + 1.00j and vector B with rightwards

arrow on top = -3.00i + 3.00j.
A) 117°

B) 88.1°

C) 26.6°

D) 30.0°

E) 45.2°

1 answer:

sertanlavr [38]2 years ago

6 0

Answer:

C) 26.6

Explanation:

I don't know how to calculate vector

You might be interested in

The magnetic strips on credit cards can become demagnetized. What type of magnet are they?

Damm [24]

I think you're fishing for "temporary magnet" or something like that,
but I don't agree with it.

Credit card strips, refrigerator magnets, recording tape, bar magnets,
and big heavy horseshoe magnets are permanent magnets ... you don't
have to keep an electric current circulating around them to make them
magnetic.

But that doesn't mean that they stay magnetic no matter WHAT you do
to them. They can be DEmagnetized by being heated, dropped on the
floor, hit with a hammer, or in the presence of another, stronger magnet.

4 0

2 years ago

Read 2 more answers

How can u tell matched forces act on objects?

mamaluj [8]

Answer:If an object's speed changes, or if it changes the direction it's moving in,

then there must be forces acting on it. There is no other way for any of

these things to happen.

Once in a while, there may be a group of forces (two or more) acting on

an object, and the group of forces may turn out to be "balanced". When

that happens, the object's speed will remain constant, and ... if the speed

is not zero ... it will continue moving in a straight line. In that case, it's not

possible to tell by looking at it whether there are any forces acting on it

3 0

2 years ago

What are power tools

butalik [34]

Answer:

Tools that require electricty like drills

Explanation:

8 0

2 years ago

Read 2 more answers

The ability to store electrical energy is called<br><br> Voltage <br> Capacitance

NARA [144]

Hey!!

here is your answer>>>

Volaltage = It is the power to push the electrons

Capacitance = The ability to store electrical energy!.

Hope my answer helps!

5 0

2 years ago

A 6.5 kg rock thrown down from a 120m high cliff with initial velocity 18 m/s down. Calculate

Olegator [25]

Answer:

See the answers below.

Explanation:

In order to solve this problem we must use the principle of energy conservation. Which tells us that the energy of a body will always be the same regardless of where it is located. For this case we have two points, point A and point B. Point A is located at the top at 120 [m] and point B is in the middle of the cliff at 60 [m].

$E_{A}=E_{B}$

The important thing about this problem is to identify the types of energy at each point. Let's take the reference level of potential energy at a height of zero meters. That is, at this point the potential energy is zero.

So at point A we have potential energy and since a velocity of 18 [m/s] is printed, we additionally have kinetic energy.

$E_{A}=E_{pot}+E_{kin}\\E_{A}=m*g*h+\frac{1}{2}*m*v^{2}$

At Point B the rock is still moving downward, therefore we have kinetic energy and since it is 60 [m] with respect to the reference level we have potential energy.

$E_{B}=m*g*h+\frac{1}{2}*m*v^{2}$

Therefore we will have the following equation:

$(6.5*9.81*120)+(0.5*6.5*18^{2} )=(6.5*9.81*60)+(0.5*6.5*v_{B}^{2} )\\3.25*v_{B}^{2} =4878.9\\v_{B}=\sqrt{1501.2}\\v_{B}=38.75[m/s]$

The kinetic energy can be easily calculated by means of the kinetic energy equation.

$KE_{B}=\frac{1}{2} *m*v_{B}^{2}\\KE_{B}=0.5*6.5*(38.75)^{2}\\KE_{B}=4878.9[J]$

In order to calculate the velocity at the bottom of the cliff where the reference level of potential energy (potential energy equal to zero) is located, we must pose the same equation, with the exception that at the new point there is only kinetic energy.

$E_{A}=E_{C}\\6.5*9.81*120+(0.5*9.81*18^{2} )=0.5*6.5*v_{C}^{2} \\v_{c}^{2} =\sqrt{2843.39}\\v_{c}=53.32[m/s]$

5 0

2 years ago