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Annette [7]
3 years ago
9

Which changes in an electric motor will make the motor stronger? Check all that apply.

Physics
1 answer:
ollegr [7]3 years ago
8 0
To make the motor turn faster we can:
(a) increase the current
(b) use stronger magnets
(c) push the magnets closer to the coil
(d) put an iron centre piece into the coil
(e) adding more sets of coils
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Gravity causes all falling objects to accelerate at a rate of 98 m/s2.<br> O True<br> O False
aleksandrvk [35]
It’s true the acceleration of falling objects on earth due to gravity is 98ms2
8 0
3 years ago
What is the force required to lift the balloon with
Olin [163]

No force is required to lift that balloon. In fact, force is required to hold it down, and if you let go, it's up, up, and away.

Since the balloon's density is less than the density of the air around it, it's lighter than the air it displaces, there is a net upward buoyant force acting on it, and it floats up !

3 0
3 years ago
The critical angle for total internal reflection occurs when:___________.
Anastaziya [24]

Answer:

b) the refracted ray has an angle of 90 degrees

Explanation:

The angle of incidence is measured with respect to the normal separation of the media. The critical angle for total internal reflection occurs is:

\theta=arcsin(\frac{n_2}{n_1})

Here n_2 and n_1 are the refractive index of the mediums. This equation is an application of Snell's law, for the case where  the refracted ray has an angle of 90^\circ.

5 0
3 years ago
A bat hits a moving baseball. If the bat delivers a net eastward impulse of 1.3 N-s and the ball starts with an initial horizont
Georgia [21]

Answer:

141.30grams

Explanation:

First, denote our known values;

J=1.3N-s(+,east)\\u=-3.8ms^-^1(-,west)\\v=5.4ms^-^1(+,east)\\m=?

Mass is impulse divided by change in velocity:

m=\frac{J}{v-u}\\=\frac{1.3}{5.4--3.8}\\\\=\frac{1.3}{9.2}\\=0.1413Kgs

Hence, the mass of the ball is 141.30grams

3 0
3 years ago
Pls help im begging you
Lostsunrise [7]

Answer:

I think it's TRUE because forces change an object's motion but dont quote me on it ok? Cause I'm not a 100 percent sure

7 0
3 years ago
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