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4 years ago

10

4. What information does the atomic number of an element give us?

1 answer:

bulgar [2K]4 years ago

5 0

Answer: It gives us the identity of the element as well as the number of protons.

Explanation:

Because the number of protons is specific for each element, we can determine what element we are looking at just by the atomic number. For example the element with the atomic number of 1 is Hydrogen, atomic number of 2 is Helium, atomic number of 3 is Lithium and so forth.

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A new ride being built at an amusement park includes a vertical drop of 126.5 meters. Starting from rest, the ride vertically dr

Readme [11.4K]

Answer:

Speed at the bottom of the roller coaster = 49.79 m/s

Explanation:

A new ride being built at an amusement park includes a vertical drop of 126.5 meters. Starting from rest, the ride vertically drops that distance before the track curves forward.

We have to find the speed at the bottom.

Here the gravitational energy fully converts to kinetic energy, so we equate it.

Gravitational energy = $m\times g\times h$

Kinetic energy = $0.5 \times m\times v^{2}$

$m\times g\times h$ = $0.5 \times m\times v^{2}$

$9.8\times 126.5 = 0.5\times v^{2}$

$v^{2}$ = 2479.4

Velocity, v = 49.79 m/s

7 0

3 years ago

Suppose you have an object tied to a rope and are rotating it over your head in uniform circular motion. What would have to do t

Crazy boy [7]

Answer:

We must duplicate the length of the rope (R'=2R) to get

$F'=\frac{1}{2}F$

Explanation:

The equation of the centripetal force is given by:

$F_{c}=ma_{c}$

$F_{c}=m\frac{v^{2}}{R}$

Where:

R is the length of the rope

m is the mass of the object

v is the speed of the object

If we want to reduce the centripetal force in half, we can duplicate the length of the rope (R'=2R), which means:

$F'_{c}=m\frac{v^{2}}{R'}$

$F'_{c}=m\frac{v^{2}}{2R}$

$F'_{c}=\frac{1}{2}F_{c}$

I hope it helps you!

6 0

3 years ago

A dog is running at 15 m/s and then slows down to 10 m/s. It takes him two seconds to do this. What is the dog's acceleration

OLga [1]

Explanation:

a = (Vf-Vi)/t

= (10m/s - 15m/s)/2s

a = -5 / 2 m/s^2

• so the dog diaccelerate at the rate of 5/2 m/s^2

hope it helps

6 0

3 years ago

A moving car has momentum. if it moves twice as fast its momentum is ____________ as much

Nikolay [14]

It's momentum is twice as much.

3 0

3 years ago

If a runner travels 50 m in 5 sec, his average speed is what?

Maru [420]

Answer:

If an object's average speed is 5 m/s, it will move 5 m in 1 s.

Explanation:

7 0

3 years ago

Read 2 more answers