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3 years ago

When a wire with a current is placed in a magnetic field,

Physics

1 answer:

Jet001 [13]3 years ago

6 0

A. electrical energy is transformed into mechanical energy.

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Two boys (same height) are standing on a bridge each boy throws a rock straight down into the river below. they throw the rock a

GalinKa [24]

Perhaps one threw it at a greater velocity?

7 0

3 years ago

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An object is thrown upward from the top of a 160 foot building with an initial velocity of 48 feet per second. The height h of t

inn [45]

Answer:

$t=5s$

Explanation:

From free falling objects we know that height is equal to:

$h=h_{o}+v_{oy}t+\frac{1}{2}gt^{2}$

From the exercise we know that

$h_{o}=160ft\\v_{oy}=48ft/s\\g=-32 ft/s^{2}$

Being said that, we can calculate how long would it take to the object to hit the ground knowing that the height at that point is 0

$0=160ft+(48ft/s)t-\frac{1}{2}(32ft/s^2)t^2$

Solving the quadratic formula we got that

$t=\frac{-b±\sqrt{b^{2}-4ac}}{2a}$

$a=-16\\b=48\\c=160$

$t=-2s$ or $t=5s$

Since time can not be negative the logical answer is <u><em>t=5s</em></u>

So, the object hit the ground at 5s

6 0

3 years ago

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An out-of-control train is racing toward the Metropolis terminal train station - only Superman can help. The train has a mass of

Finger [1]

Answer:

22826.09 m/s

Explanation:

From the law of conservation of momentum,

Sum of momentum before collision = sum of momentum after collision.

For an inelastic collision, the train and the superman have a common velocity

Note: For the superman to stop the train in an opposite direction, the common velocity after collision is zero, and such the total momentum after collision is zero

Therefore,

MU + mv = 0

MU = - mu............................................ Equation 1

Making u the subject of the equation

u = -MU/m......................................... Equation 2

Where M = mass of the train, U = initial velocity of the train, m = mass of the super man, u = initial velocity of the superman.

Given: M = 75000 kg, U = 35 m/s, m = 115 kg.

u = -(75000×35/115)

u = -22826.09 m/s

Note: The velocity is negative because the direction of the superman is opposite the direction of the train.

Hence the superman have to fly 22826.09 m/s in the opposite direction

8 0

3 years ago

The ____ is a measure of the number of waves that pass a point in a given amount of time

nikitadnepr [17]

The (frequency of the wave multiplied by the number of seconds
in a given amount of time) is the measure of the number of waves that
pass a point in that amount of time.

If you had said "in one second" instead of "in a given amount of time,
then the word in the blank would simply be frequency.

8 0

3 years ago

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What is the doppler effect in astronomy used for?

harkovskaia [24]

Answer:

The Doppler effect for electromagnetic waves such as light is of great use in astronomy and results in either a so-called redshift or blueshift. It has been used to measure the speed at which stars and galaxies are approaching or receding from us; that is, their radial velocities.

7 0

3 years ago

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