A laser produces light at 5.32x10-7 m.
What is the frequency of the light?
A. 1.77x10-6 Hz
B. 1.60x1011 Hz
C. 1.88x107 Hz
D. 5.64x1014 Hz

Answer:

It would take 1 s to hear the echo.

Explanation:

Here, the sound covered a total of 340 meters, since it bounces off the canyon wall and travels back to Miles in the form of echo.

The time elapsed can be determined by,

v = [tex]\frac{2D}{t}[/tex]

⇒ t = [tex]\frac{2D}{v}[/tex]

where: v is the speed of sound in air (343 m/s), D is the distance of the nearest canyon (170 m).

So that,

2D = 2 x 170 = 340 m

Thus,

t = [tex]\frac{340}{343}[/tex]

 = 0.9913 s

t = 1 s

It takes 1s for Miles to hear his echo.

Thus Kinetic energy of the object is 200J when mass is 25 kg and velocity is 4 m/s.

Answer:

the answer is A

Explanation:

Answer:

8cm

Explanation:

The general formula to find this is F/X where in this case the f is the total of the two forces (100+100) and x is the sum of the length ( 20+5) which together comes 200&25respectively then divide 200 with 25 which comes 8cm.

Answer:

Explanation:

ok

Answer:

Hey mate....

Explanation:

This is ur answer.....

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Answer:

the salt solution exerts a greater up thrust on the egg which balances the weight of the egg, so the egg floats in a strong salt solution but sinks in fresh water

Specific heat capacity is defined as the amount of heat required to raise the temperature of 1 kilogram of a substance by 1 kelvin (SI unit of specific heat capacity J kg−1 K−1). From: Basic Physics and Measurement in Anaesthesia (Fourth Edition), 1995.

water level will decrease because there are more evaporation and transpiration

Answer:

Laser light differs from normal light because laser lights are monochromatic which means it only shines one color and only that color :3

Explanation:

:3

Answer:

M = 500 J

Explanation:

Given that,

Mass, M = 1000 g = 1 kg

Height, h = 10 m

Potential energy is given by :

P = mgh

P = 1×10×10

P = 100 J

The kinetic energy at ground = 400 J

Mechanical energy = sum of kinetic and potential energy

So,

M = 100 + 400

M = 500 J

So, the mechanical energy of the system is 500 J.

Answer:

momentum= mass x velocity

= 11 x 1200 =13200kgm/s

Answer:

Bohr Model

Explanation:

Answer: [tex]0\ ms^{-1}[/tex]

Explanation:

Given

If an object reaches the topmost point i.e. it cannot travel beyond that point as its velocity is zero at the topmost point

As some velocity is needed to move the object, so velocity at topmost point is zero

Answer:

Eastward, at 11 m/s^2

Explanation:

64N-31N=unbalanced force of 33N

F=ma

33N=(3kg)a

a=11m/s^2 to the East

Answer:

ok

Explanation:

the correct answer is C please follow me

Answer:

I would say temperature

Answer:

The energy used in the pendulum is the initial Potential (Mechanical) Energy, P.E. given to the Clay ball attached to the inclined and extended string by virtue of its elevated position in relation to the rest position (lower state)

The swinging of the pendulum is brought about by the dynamic equilibrium between the initial potential energy, P.E. and the Kinetic Energy, K.E., of the pendulum when it is in motion

The (total) Mechanical Energy, M.E. of the ideal pendulum is constant at all times during the motion of the pendulum and it is given by the following formula;

M.E. = P.E. + K.E.

At the top of the swing, P.E. is maximum and K.E. is zero

Similarly, at the mid (lowest) point in the swing, instantaneously, P.E. is zero and K.E. is maximum

Explanation:

Answer:

C. Surface area

Explanation:

The rate of  chemical reaction depends on various factors such as:

Effect of surface area of reactants: the rate of a chemical reaction can be increased by increasing the the area of contact of the reacting substances. This is especially important when one or more of the reactants are solids., because only the particles of the solid that are exposed are able to take part in the reaction at each instant of time. Therefore, the greater the surface area of the solid reactant particles the faster the reaction.

The surface area of solid reactants can be increased by grinding or pelletizing, thus allowing for a greater contact between the reacting particles,

The instance in which one of the solid reactants was treated in a coffee grinder before adding to the reaction container is one way of increasing the surface area of a reactant.

Answer:

Velocity is a vector (it has magnitude and direction), so the overall velocity of an object can be found with vector addition of the x and y components: v2 = vx2 + vy2. The units to express the horizontal and vertical distances are meters (m).

Answer:

2 , 200%

Explanation:

Mechanical advantage of a machine is defined as how much the machine multiplies the applied force.

It is given that :

Input force of the lever = 40 N

The weight of the boulder or the output force = 80 N

Therefore, the mechanical advantage = output force / input force

                                                               [tex]$=\frac{80}{40}$[/tex]

                                                               = 2

Mechanical efficiency is obtained by the dividing the output by the input and multiplying it with 100.

i.e. Efficiency = output / input x 100

                      [tex]$=\frac{80}{40}\times 100$[/tex]

                     = 200 %

Answer:

F=ma

5N=0.3a

a=5/0.3=16.66m/s²

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Answer:

16.7

Explanation:

acceleration=force/mass

Answer:

If it accelerated from 5 to 10 in one second then we know that acceleration is final (velocity-initial velocity)/

time

this gives (10-5)/1

=5m/s^2

force = mass x acceleration so = 150 x 5

this gives us a force of 750N

impulse is force x time so = 750 x 1

this tells us the impulse is 750 N.s

All of this is assuming it accelerated to 10m/s in one second.

The definition of impulse allows to find the impulse response for the acceleration of the body is:

Given parameters

To find

The impulse is the change of the momentum of a body, it is a vector quantity

    I = ∫ F. dt = Δp

Where the bold indicate vectors, I is the momentum, F the force, t the time, Δp the change in moment

The momentum is defined as the product of the mass of the body and its speed.

     p = m v

We substitute in the expression of impulse  

    I = [tex]m v_f - m v_o[/tex]  

Let's calculate.

    I = 150 (10 -5)

    I = 750 N s

In the direction of acceleration.

In conclusion using the definite of impulse we can find the impulse response for the acceleration of the body is:

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