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dsp73
3 years ago
13

If your heart is not strong enough or efficient enough, it is difficult to (3 points)

Physics
2 answers:
Lyrx [107]3 years ago
8 0

it's difficult to breathe.

Mariulka [41]3 years ago
5 0

-- climb 100 stairs 2 at a time

-- run a mile in less than a day

-- lift one end of your car without help

-- run for president

-- fall deeply in love

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Talking to adults can be intimidating and uncomfortable if you do not yet feel like one. However, learning how to effectivelycom
Korvikt [17]

Answer: i didnt look at your question its to long

Explanation:

8 0
3 years ago
When an object is heated it …………… and when it cools it …………………..
omeli [17]

Answer:

When an object is heated it Expand and when it cools it Contract

Explanation:

One of the effect of heat on matter is expansion. An increase in the temperature of an object causes it to expand and a decrease causes it to contract

4 0
3 years ago
. A newly discovered planet has three times the mass and five times the radius of Earth. What is the ratio of the acceleration d
NikAS [45]

Answer:

0.12

Explanation:

The acceleration due to gravity of a planet with mass M and radius R is given as:

g = (G*M) / R²

Where G is gravitational constant.

The mass of the planet M = 3 times the mass of earth = 3 * 5.972 * 10^24 kg

The radius of the planet R = 5 times the radius of earth = 5 * 6.371 * 10^6 m

Therefore:

g(planet) = (6.67 * 10^(-11) * 3 * 5.972 * 10^24) / (5 * 6.371 * 10^6)²

g(planet) = 1.18 m/s²

Therefore ratio of acceleration due to gravity on the surface of the planet, g(planet) to acceleration due to gravity on the surface of the planet, g(earth) is:

g(planet)/g(earth) = 1.18/9.8 = 0.12

3 0
3 years ago
A sample of polonium-210 was left for 414 days.
jenyasd209 [6]

Answer:

PO(1) = PO(0) / 2       1 refers to 1 half life of PO(0)

PO(2) = PO(1) / 2 = P(0) / 4        amount of PO left after 2 half-lives

PO(3) = PO(2) / 2 = PO(0) / 8     amount of PO left after 3 half-lives

414 da / 138 da = 3       3 half-lives pass in 414 da

PO(0) = 8 PO(3) = 8 * 1.45E-4 g = 1.16E-3 g = .00116 g  after 414 days        

6 0
2 years ago
How does the density of most metals compare to most non metals?
Neko [114]
Harder. Not compressible(unless using an extremely strong force). Non-metal have more of a chance of breaking than metals.
8 0
3 years ago
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