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4 years ago

A 12.0 -kg ball has a momentum of 25 kg m/s. What is the balls speed?

Physics

1 answer:

Brut [27]4 years ago

3 0

P = mv

v = p/m

v = (25 kg m/s) / (12.0 kg)
v = 2.08 m/s

v = 2.1 m/s

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A fixed 15.3-cm-diameter wire coil is perpendicular to a magnetic field 0.77 T pointing up. In 0.20 s , the field is changed to

maksim [4K]

Answer:

Induced emf will be 0.468 volt

Explanation:

We have given diameter of wire d = 15.3 cm

So radius $r=\frac{d}{2}=\frac{15.3}{2}=7.65cm$

So area $A=\pi r^2=3.14\times (7.65)^2=183.76\times 10^{-4}m^2$

Change in magnetic field dB = 0.26 - 0.77 = -0.51 T

Time for change in magnetic field dt = 0.26 sec

We know that emf is given by $e=\frac{-d\Phi }{dt}=-A\frac{dB}{dt}=-183.76\times 10^{-4}\times \frac{-0.51}{0.2}=0.0468volt$

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3 years ago

An electric filament lamp is connected to a power supply and switched on.

ladessa [460]

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3 years ago

Which steps can be taken to translate the phrase “the height of a tree is increased by seven inches” into an algebraic expressio

ololo11 [35]

Answer:

Explanation:

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3 years ago

Read 2 more answers

Energy is observed in two basic forms: potential and kinetic. Which of the following correctly matches these forms with a source

Travka [436]

Answer:

option C

Explanation:

The correct answer is option C

Kinetic energy is the energy which is due to the motion of body.

Potential energy is the energy due to virtue of position of the object.

option A is not true because potential energy is due the position of the body

Option B should be the potential energy not kinetic energy.;

Option D is motion of individual molecule leads to kinetic energy not potential energy.

So, the correct answer is option is the covalent bonds of a sugar molecule is potential energy because of the position of bond.

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3 years ago