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3 years ago

Which of the following statements is true?

Physics

1 answer:

erastova [34]3 years ago

6 0

Hi there!

Question - Which of the following statements is true?

Answer - C. You are exposed to nuclear radiation every day.

Why - "radiation in the form of elementary particles emitted by an atomic nucleus, as alpha rays or gamma rays, produced by decay of radioactive substances or by nuclear fission."

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Hello I need some help.Two guys enetr in a room,a guy come from outside(there is cold)and another guy come from a room(there is

slavikrds [6]

I would feel warm because putting cold and hot together is gonna be warm because with the cold it is cooling down the hot to make warm

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3 years ago

I will give brainiest to the first person to tell me who is the Carolina panther QB

Inessa [10]

Answer:

Cam Newton (currently but might change because he has been allowed to trade)

Will Grier

Kyle Allen

Explanation:

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3 years ago

Consider a river flowing toward a lake at an average velocity of 3 m/s. the river height is 90m above the lake. what is the tota

strojnjashka [21]

Kinetic energy per unit of mass is

$K=\frac{v^{2} }{2}$

Given, $v=3m/s^{2}$

Therefore,

$K=\frac{(3^{2} m/s^{2} )^2}{2}$

$K=4.5 J/kg$

Now potential energy per unit mass is

$p=g\times h$

Given, $h=90 m$

Therefore,

$p= 9.8m/s^2 \times 90$

$p=882.9 J/kg$

Thus, total mechanical energy of the river water per unit mass is

$T=K+p=(4.5+882.9)J/kg$

$T=887.9 J/kg$

$T=0.887 kJ/kg$

6 0

3 years ago

The Enterprise goes into orbit around a mysterious planet. The ship moves at 4200 m/s in a circle of radius 4.91 x 10^7 m. What

NeX [460]

Answer:

M = 1.3*10^25 Kg

Explanation:

3 0

3 years ago

A cat jumps off a table which is 1.5 m high. If the initial velocity of the cat is 10 m/s, at an angle of 37 degrees above the h

Black_prince [1.1K]

Answer:

11.5 m

Explanation:

First, find the time it takes to land.

Given:

Δy = -1.5 m

v₀ = 10 sin 37° m/s

a = -9.8 m/s²

Find: t

Δy = v₀ t + ½ at²

-1.5 m = (10 sin 37° m/s) t + ½ (-9.8 m/s²) t²

-1.5 = 6.02 t − 4.9 t²

4.9 t² − 6.02 t − 1.5 = 0

Solve with quadratic formula:

t = [ -(-6.02) ± √((-6.02)² − 4(4.9)(-1.5)) ] / 2(4.9)

t = 1.44

Now find how far it moves horizontally in that time:

Given:

t = 1.44 s

v₀ = 10 cos 37° m/s

a = 0 m/s²

Find: Δx

Δx = v₀ t + ½ at²

Δx = (10 cos 37° m/s) (1.44 s) + ½ (0 m/s²) (1.44 s)²

Δx = 11.5 m

The cat lands 11.5 meters from the table.

7 0

3 years ago