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3 years ago

When the angle of incidence equals the angle of reflection it is called the law of

Physics

2 answers:

BartSMP [9]3 years ago

8 0

The angle of incidence ALWAYS equals the angle of reflection.

THAT'S the law of reflection.

Reptile [31]3 years ago

6 0

The law of reflection

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A hand pushes two blocks, A and B, along a frictionless table for a distance d. When the hand starts to push, the blocks are mov

Kitty [74]

<span>net work = change in kinetic energy

for Block B, we just have the force from block A acting on it
F(ab)d= .5(1)vf² - .5(1)(2²)
F(ab)d= .5vf² - 2

Block A, we have the force from the hand going in one direction and the force of block B on A going the opposite direction

10-F(ba)d = .5(4)vf² - .5(4)(2²)
10-F(ba)d = 2vf² - 8
F(ba)d = 18 - 2vf²

now we have two equations:
F(ba)d = 18 - 2vf²
F(ab)d= .5vf² - 2

since the magnitude of F(ba) and F(ab) is the same, substitute and find vf (I already took into account the direction when solving for F(ab)

10-.5vf² + 2 = 2vf² - 8
12 - .5vf² = 2vf² - 8
20 = 2.5vf²
vf² = 8

they both will have the same velocity
KE of block A= .5(4)(2.828²) = 16 J
KE of block B=.5(1)(2.828²) = 4 J</span>

5 0

3 years ago

New research is using functional magnetic resonance imaging (MRI), a scan of the brain that shows specific areas that are activa

kolezko [41]

Answer:

-Frontal Lobe

-Medulla Oblangata

Explanation:

-Functional magnetic resonance imaging or functional MRI (fMRI) measures brain activity by detecting changes associated with blood flow. Such areas light up in scans.

-The frontal lobe because it deals with reasoning and thoughts. Also the -

Medulla Oblongata because it is responsible for breathing and heart rate.

4 0

3 years ago

A horse runs a race on a oval track and starts and ends at the same point. He runs one mile track in 7 minutes.

Sergeeva-Olga [200]

Answer:

speed = 8.57mph while v = 0 mph

Explanation:

The horse is running 1 mile in 7 minutes. Then for a total of 1 hour, 60 minutes, the horse should be able to run a distance of

$\frac{1*60}{7} = \frac{60}{7} = 8.57mph$

So the horse speed is 8.57 miles per 60 minutes, or 8.57 mph (mile per hour). But if he ends up at the same point as before int he oval track, one can argue that the displacement is 0, and so is its velocity.

4 0

3 years ago

Two wires are perpendicular to each other and form a coordinate axis. The current in the vertical wire is going up (in the posit

sergij07 [2.7K]

Answer:

Magnetic field shall be zero at exactly in between the wires.

Explanation:

We can find the magnetic field by biot Savart law as follows

$\overrightarrow{dB}=\frac{\mu _{0}I}{4\pi }\int \frac{\overrightarrow{dl}\times \widehat{r}}{r^{2}}$

For current carrying wire in positive y direction we have

$\overrightarrow{dB_{1}}=\frac{\mu _{0}Idl}{4\pi }\int \frac{\widehat{j}\times \widehat{r_{1}}}{r_{1}^{2}}$

Similarly for wire carrying current in -y direction we have $\overrightarrow{dB_{2}}=\frac{-\mu _{0}Idl}{4\pi }\int \frac{\widehat{j}\times \widehat{r_{2}}}{r_{2}^{2}}$

Thus the net magnetic field at any point in space is given by

$\overrightarrow{dB_{1}}+\overrightarrow{dB_{2}}$

$\frac{\mu _{0}Idl}{4\pi }\int \frac{\widehat{j}\times \widehat{r_{1}}}{r_{1}^{2}}+\frac{-\mu _{0}Idl}{4\pi }\int \frac{\widehat{j}\times \widehat{r_{2}}}{r_{2}^{2}}=0\\\\\Rightarrow \overrightarrow{r_{1}}=\overrightarrow{r_{2}}$

For points with same position vectors from the 2 wires we have a net zero magnetic field. These points are exactly midway between the 2 wires

4 0

3 years ago

7) The coefficient of performance (COP) of a refrigerator is defined as the ratio of A) the heat removed from the inside to the

julsineya [31]

Answer:

C) the heat removed from the inside to the work done to remove the heat.

Explanation:

Refrigerator is a heat engine working in reverse direction . Heat from cold source is taken out , some work is done to remove them and total heat and work energy is thrown into outside surrounding .

If q heat is taken out and W is work done to get this heat out .

coefficient of performance ( COP ) = q / W .

Hence C ) is the right choice .

8 0

2 years ago

When the angle of incidence equals the angle of reflection it is called the law of ​

When the angle of incidence equals the angle of reflection it is called the law of