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4 years ago

What Electromagnetic has a shorter wavelength

Physics

2 answers:

sesenic [268]4 years ago

8 0

And X rays have even shorter ...

True [87]4 years ago

3 0

The electromagnetic that has a shorter wavelength is ultraviolet (UV)

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what is the average acceleration of a car if a car rest from 0m/s and reaches a final velocity is 50m/s in 10m/s

GuDViN [60]

Answer:

Assuming that you meant the final velocity of 50 m/s was reached in 10 s, the answer would be 5 m/s^2.

Explanation:

$V_{f} = V_{i} + at$

So we update that with the values that we have.

$50 = 0 +a(10)$

then simplify that using algebra to solve for a and we get 5 m/s^2

6 0

3 years ago

You push very hard on a heavy desk, trying to move it. You do work on the desk:

frozen [14]

Answer:

Explanation:

We know that work done is given by

$W=F.d=Fdcos\Theta$

So there are two case in which work done is zero

First case is that when force and displacement are perpendicular to each other

And other case is that when there is no displacement

So for work to be done there must have displacement, if there is no displacement then there is no work done

So option (c) will be the correct option

3 0

3 years ago

A bullet traveling at 350 m/s hits a tree, penetrating 0.125 m into the tree before stopping. The mass of the bullet is 0.200 kg

Sloan [31]

Answer:

$-4.9\cdot 10^5 m/s^2$

Explanation:

The motion of the bullet is a uniformly accelerated motion, therefore we can find its acceleration by using the following suvat equation:

$v^2-u^2=2as$

where

v is the final velocity

u is the initial velocity

a is the acceleration

s is the distance covered

For the bullet in this problem:

u = 350 m/s is the initial velocity of the bullet

v = 0 is the final velocity (the bullet comes to a stop)

s = 0.125 m is the stopping distance of the bullet

Therefore, by solving the equation for a, we find its acceleration:

$a=\frac{v^2-u^2}{2s}=\frac{0^2-350^2}{2(0.125)}=-4.9\cdot 10^5 m/s^2$

And the negative sign tells that the direction of the acceleration is opposite to that of the velocity.

7 0

4 years ago

Two resistors of resistances R1 and R2, with R2>R1, are connected to a voltage source with voltage V0. When the resistors are

Contact [7]

Answer:

r=0.127

Explanation:

When connected in series

Current = I

When connected in parallel

Current = 10 I

We know that equivalent resistance

In series R = R₁+R₂

in parallel R= R₁R₂/(R₂+ R₁)

Given that voltage is constant (Vo)

V = I R

Vo = I (R₁+R₂) ------------1

Vo = 10 I (R₁R₂/(R₂+ R₁)) -------2

From above equations

10 I (R₁R₂/(R₂+ R₁)) = I (R₁+R₂)

10 R₁R₂ = (R₁+R₂) (R₂+ R₁)

10 R₁R₂ = 2 R₁R₂ + R₁² + R₂²

8 R₁R₂ = R₁² + R₂²

Given that

r = R₁/R₂

Divides by R₂²

8R₁/R₂ = ( R₁/R₂)²+ 1

8 r = r ² + 1

r ² - 8 r+ 1 =0

r= 0.127 and r= 7.87

But given that R₂>R₁ It means that r<1 only.

So the answer is r=0.127

8 0

4 years ago

Examine the scenario.

vovangra [49]

Answer:

acceleration 8 km/h/s south

Explanation:

First of all, let's remind that a vector quantity is a quantity which has both a magnitude and a direction.

Based on this definition, we can already rule out the following two choices:

distance: 40 km

speed: 40 km/h

Since they only have magnitude, they are not vectors.

Then, the following option:

velocity: 5 km/h north

is wrong, because the car is moving south, not north.

So, the correct choice is

acceleration 8 km/h/s south

In fact, the acceleration can be calculated as

$a=\frac{v-u}{t}$

where

v = 40 km/h is the final velocity

u = 0 is the initial velocity

t = 5 s is the time

Substituting,

$a=\frac{40 km/h-0}{5 s}=8 km/h/s$

And since the sign is positive, the direction is the same as the velocity (south).

7 0

4 years ago