All categories

3 years ago

Can the number of protons in an element ever change?

Physics

2 answers:

larisa [96]3 years ago

8 0

No it cannot change:)

adelina 88 [10]3 years ago

4 0

The number of protons in any element can never change.

You might be interested in

One star has a mass slightly more than the mass of the sun. Which of these graphs would best model and predict the lifetime of t

Oksanka [162]

Answer:

Explanation:

6 0

4 years ago

How could a homework machine help students all around the world?

slamgirl [31]

Answer:

Hello There!!

Explanation:

The machine can help you alot and do all your homework while you rest and let the homework machine do it and get good grades because of it with no worries but if the machine does it then you won't learn how to do them.

hope this helps,have a great day!!

~Pinky~

8 0

3 years ago

Each piston of an engine makes a sharp sound every other revolution of the engine. How fast is a race car going if its eight-cyl

goldfiish [28.3K]

Answer:

93.75 m/s

Explanation:

Given:

The frequency of the sound = 750 Hz

The number of pistons making the sound = 8

Revolutions made by the engine = 2000 revolutions/ km

Thus,

the frequency of sound by 1 piston = 750 / 8 = 93.75 Hz

also, it is given that for every other revolution sound is made.

thus, for every 2 revolution sound is made

therefore,

Number of revolutions per second = 93.75 Hz × 2 = 187.5 rev/s

Now,

the speed of the car will be calculated as:

= Number of revolutions per second / Revolutions made by the engine

The speed of the car = $\frac{187.5\ rev/s}{2000\ rev/km}$

The speed of the car = 0.09375 km/s = 93.75 m/s

3 0

3 years ago

A 48.0-kg astronaut is in space, far from any objects that would exert a significant gravitational force on him. He would like t

marusya05 [52]

Answer:

The astronaut is moving at a speed of 0.36m/s

Explanation:

Speed here corresponds to velocity

The astronaut's mass = 48kg

velocity of astronaut = ?

mass of socket = 0.72kg

velocity of socket = 5m/s

mass of the spanner = 0.8kg

velocity of spanner = 8m/s

change in time = 0.05 -0 = 0.05sec

mass of the mallet = 1.2kg

velocity of mallet = 6m/s

change in time = 9.9 -0 = 9.9sec

To find the astronaut velocity, we would calculate the total momentum which is the astronaut.

∑momentum (M) = ∑astronaut momentum

∑M = ∑astronaut M

∑astronaut M = M of socket + M of spanner + M of mallet

momentum = mass × velocity

(mass × velocity)of astronaut = (0.72×5) + (0.8×8) + (1.2×6)

48 × velocity of astronaut= 3.6 + 6.4 + 7.2

48 × velocity of astronaut= 17.2

velocity of astronaut = 17.2/48

velocity of astronaut = 0.36m/s

The astronaut is moving at a speed of 0.36m/s

5 0

3 years ago

True or False: Litmus paper turns blue in bases and red in acids. <br>True <br>False

lutik1710 [3]

False because bases turn red litmus paper to blue and acids turn blue litmus paper red

8 0

1 year ago