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3 years ago

Which electromagnetic radiation can be seen with the human eye

1 answer:

6 0

Answer:the human retina can only detect incident light that falls in waves 400 to 720 nano-meters long so we cant see microwave or ultraviolet wavelengths. this also applies to infrared lights which has wavelengths longer than visible and shorter than microwaves thus being invisible to the human eye

Explanation:

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What is the magnitude of the instantaneous velocity (speed) of a freely falling object 25 s after it is released from a position

Marta_Voda [28]

Answer:

The instantaneous velocity of the object is 250 m/s

Explanation:

Given;

time of the object motion, t = 25 s

acceleration due to gravity, g = 10 m/s²

The instantaneous velocity of the object is given as;

v = u + gt

where;

u is the initial velocity of the object = 0 (since it was released from rest)

Substitute the givens;

v = 0 + (10 x 25)

v = 250 m/s

Therefore, the instantaneous velocity of the object is 250 m/s

6 0

3 years ago

if an object traveling in one direction has s positive velocity , what kind of velocity would the same object traveling in the o

AveGali [126]

A negative velocity.

5 0

3 years ago

Read 2 more answers

When water in clouds undergoes condensation, it can lead to?

olga_2 [115]

It will lead to rain. I know this because as the clouds move over water sources like oceans, lakes, and rivers, the water evaporates and rises. The water then liquefies into little water droplets. As the cloud moves over more water the droplets get scrunched up and get bigger over time and soon they get heavy and gravity pulls the droplets down to earth as rain. The End.

4 0

3 years ago

PLEASE HELP An object is thrown upward with an initial velocity of 32.1 m/s. What is its velocity in 4.0 s? (use g = 9.81 m/s2).

grigory [225]

Answer:

-7.14

Explanation:

According to equation of motion

v = u + at

where

v is the final velocity at any time t

u is the initial velocity

a is the acceleration

and t is the time

___________________________________________

Given

An object is thrown upward it means

its initial velocity is in upward direction

but acceleration due to gravity is in downward direction which will cause to decrease the velocity of object.

Intial velocity u = 31.1 m/s

final velocity v at 4 second we have to find.

t = 4 second

a = g = 9.81 m/s2 (it is acting in opposite direction of motion hence its sign will be negative ).

Thus

a = - 9.81 m/s2

using the above values in v = u + at

v = 32.1 - 9.81*4

v = 32.1 - 39.24

v = -7.14

Thus, correct option is -7.14.

6 0

3 years ago

HELP ASAP PLEEEEES

matrenka [14]

Explanation:

33. The 1.5kg owl is now soaring at 20m/s. What is the owl’s KE?

a. Step 1: Formula ½mv²

b. Step 2: Data m = 1.5 kg, v = 20 m/s

c. Step 3: Solve

KE = (1/2)(1.5)(20)² = 300 J

6 0

3 years ago