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Tomtit [17]
3 years ago
5

HELP What is the momentum of a 50-kg ice skater gliding across the ice at a speed of 5 m/s?

Physics
2 answers:
ki77a [65]3 years ago
7 0

Answer:

250 kgm/s

Explanation:

To calculate momentum, simply take the product of the mass and velocity.

____ [38]3 years ago
7 0
Hiiii don’t understand ok sorry
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We have seen that the voltage of a concentration cell can be affected by the concentrations of aqueous components and/or tempera
NemiM [27]

Answer:

1) Magnesium metal/magnesium ion

2) Aluminum/aluminum ion

3)  Copper metal/copper(l) ion

Explanation:

The activity series is a series that shows the ease of reactivity of substances in an electrochemical cell.

The substances that are higher up in the series are more reactive in electrochemical cells.

Magnesium is the first element in the series that has the most negative redox potential  then followed aluminium.

Hence, according to Nernst,

1) Magnesium metal/magnesium ion

2) Aluminum/aluminum ion

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3 years ago
All objects at any temperature emit radiant energy true or false
kirill [66]
The answer is true.
All object at any temperature emit radiant energy.
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3 years ago
A rock is thrown downward at a speed of 8.5 m/s and hits the ground 2.25 seconds later. From what height was the rock thrown? Wh
vekshin1

Answer:

The velocity and height is 31 m/s and 44.4 m respectively .

Explanation:

Given :

Initial speed of rock , u = 8.5 m/s .

Time taken to reach ground , t = 2.25 s .

Also , acceleration due to gravity is , g=10\ m/s^2 .

Now , to find the velocity when it hit ground .

Applying equation of motion :

v=u+at\\v=8.5+10\times 2.25\\v=31\ m/s

Also , height from which rock is thrown is given by :

h=ut+\dfrac{at^2}{2}\\\\h=8.5\times 2.25+\dfrac{10\times 2.25^2}{2}\\\\h=44.4\ m

Hence , this is the required solution .

7 0
3 years ago
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