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3 years ago

Which factor has the greatest effect on the strength of an electromagnet?

Physics

2 answers:

irakobra [83]3 years ago

6 0

B. The number of coils of wire around the core

notka56 [123]3 years ago

6 0

Answer:

Explanation:

The number of coils of wire around the core

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A physical (beam) is used to measure?

Kisachek [45]

Answer:

mass of a object is the answer

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3 years ago

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In a shot-put competition, a shot moving at 15m/s has 450J of mechanical kinetic energy. What is the mass of the shot? Please he

Llana [10]

Answer:

Mass of shot (m) = 4 kg

Explanation:

Given:

Velocity (v) = 15 m/s

Mechanical kinetic energy (K.E) = 450 J

Find:

Mass of shot (m) = ?

Computation:

Mechanical kinetic energy (K.E) = 1/2mv²

Mechanical kinetic energy (K.E) = [1/2](m)(15)²

450 = [1/2](m)(15)²

900 = 225 m

Mass of shot (m) = 4 kg

5 0

3 years ago

A 21.0 kg shopping cart is moving with a velocity of 4.0 m / s. It strikes a 7.0 kg box that is initially at rest. They stick to

jonny [76]

Explanation:

Given that,

Mass of the shopping cart, $m_s=21\ kg$

Initial speed of the shopping cart, $u_s=4\ m/s$

Mass of the box, $m_b=7\ kg$

Initial speed of the box, $u_b=0$ (at rest)

They stick together and continue moving at a new velocity. It is a case of inelastic collision.

(a) The momentum of the shopping cart before the collision is given by :

$p_s=m_s\times u_s\\\\p_s=21\times 4\\\\p_s=84\ kg-m/s$

(b) The momentum of the box before the collision is given by :

$p_b=m_b\times u_b\\\\p_b=7\times 0\\\\p_b=0$

(c) The velocity of the combined shopping cart/box wreckage after the collision is given by using the conservation of momentum as :

$m_su_s+m_bu_b=(m_s+m_b)V\\\\V=\dfrac{m_su_s+m_bu_b}{(m_s+m_b)}\\\\V=\dfrac{21\times 4+0}{(21+7)}\\\\V=3\ m/s$

Hence, this is the required solution.

8 0

3 years ago

Why should you never use the coarse adjustment on high power

umka21 [38]

Answer:

First, the image moves in and out of focus too quickly, so that it is difficult to precisely adjust the focus. Second, you run the risk of crashing the objective into the slide. Use the coarse focus only with the 4x low power objective. You can use the fine focus knob with all objectives.

Explanation:

3 0

4 years ago

Which of the following best describes a property of water?

stiks02 [169]

Correct answer is option C.

Remaining liquid over a wide temperature range

Other options are invalid.

3 0

3 years ago

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