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3 years ago

Please help me! I don't understand how to do this!

Physics

1 answer:

dezoksy [38]3 years ago

3 0

From the information in the question, the acceleration of the cart is 2.55 ms-2.

We can find the acceleration using the following information from the question;

u = 0.9 m/s

v = 6 m/s

a = 2.0 seconds

But;

a = v - u/t

v = final velocity

u = initial velocity

t = time

a = 6 - 0.9/2 = 2.55 ms-2

Force= ma

m = mass

a = acceleration

F = 6 kg × 2.55 ms-2

F = 15.3 N

Learn more about acceleration: brainly.com/question/12134554

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A car slows down from 27.7 m/s to 10.9 m/s in 2.37 s, what is the acceleration?

larisa [96]

Answer:

Answer. to final velocity 'v' =10.9 m/s in time 't' = 2.37 secs. So acceleration = -7.09 m/sec^2 or, decceleration is 7.09 m/sec^2

Explanation:

4 0

3 years ago

15. The above figure shows the path of a ray of light falling on the mirror(s) represented by a box. Which of the following arra

lana [24]

Answer: A

Explanation:

From the figure given as attachments, the error pointing upward signifies the incident ray while the one point downwards signifies the reflected ray.

One of the laws of reflection is stated that the angle of incidence is equal to the angle of reflection.

Since the two arrows are parallel to each other, then the mirror must be perpendicular to the two arrows. That is, the incident ray and the reflected ray must be perpendicular to the mirror.

Option A is the correct answer.

5 0

3 years ago

Is KBr a covalent or ionic compound

raketka [301]

Answer:

Ionic Compound

Explanation:

To identify the type of chemical bond in a molecule, look at the atoms that make up the compound. If there are two nonmetals, it is a covalent bond. If the two atoms are metals, it is a metallic bond. If one atom is a metal and the other is a nonmetal, it is an ionic bond. Ionic compounds are also known as salts. You can identify KBr as an ionic compound because potassium is a metal and a salt.

Hope this helps

6 0

3 years ago

Read 2 more answers

A loop lies in a magnetic field, with the field perpendicular to the plane of the loop. Which does not induce a current in the l

uranmaximum [27]

Answer:

Option d

Explanation:

From Maxwell's law, we know that;

$\Delta\times \vec{E} = \frac{\delta {B}}{\delta t}$

where

E = Electric Field

B = Magnetic Field

Also from Lenz Law:

emf, e = - $\frac{\delta \phi}{\delta t}$

where

$\phi$ = magnetic flux linkage

Now, in order for the current not to be induced in the loop, option a and c do not hold.

Since from the above equations, variation in both or any of the magnetic and electric fields will result in the induction of current as both are vector.

For the option b, if we rotate the loop about the diameter or increase the size or area of the loop, it will result in the change in its magnetic flux and current will be induced as is clear from the given equation:

$\phi = \vec{B}.\vec{A}$

Now, in case of option d, if we consider a uniform magnetic field, then there won't be any variation and hence no current will be induced while we slide the wire perpendicular to the loop.

5 0

3 years ago

Read 2 more answers

If the electric field has a magnitude of 460 N/C and the magnetic field has a magnitude of 0.16 T, what speed must the particles

Luda [366]

The speed of the particle to pass through the Selector is 2875 m/s

<u>Explanation:</u>

Given -

Electric field,(We can represent as E) = 460 N/C

Magnetic field, (We can represent as B) = 0.16 T

Speed,(We can represent as v) = ?

We know that the formula for finding the velocity ,

$v = \frac{E}{B} \\\\v = \frac{460}{0.16} \\\\v = 2875m/s$

Therefore, speed of the particle to pass through the Selector is 2875 m/s

7 0

4 years ago