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pishuonlain [190]
4 years ago
10

Who was the first man to walk on the moon?

Physics
1 answer:
Andrej [43]4 years ago
8 0
The first person is Neil Armstrong
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Which could describe the motion of an object?
Volgvan

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3 years ago
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A 9.13e+3 kg railroad car is rolling at 3.15 m/s when a 4.20e+3 kg load of gravel is suddenly dropped in from directly above. Wh
Feliz [49]

Answer:

6.85 m/s

Explanation:

We can solve the problem by using the law of conservation of momentum.

In fact, since there are no external forces acting, the total momentum before and after must be conserved. So we can write:

m_1 v_1 = m_2 v_2

where

m_1 = 9.13\cdot 10^3 kg is the initial mass of the car

v_1 = 3.15 m/s is the initial speed of the car

m_2 = 9.13\cdot 10^3 kg - 4.20\cdot 10^3 kg=4.93\cdot 10^3 kg is the mass of the car after the load of gravel is dropped

v2 is the final speed of the car

Solving for v2, we find

v_2 = \frac{m_1 v_1}{m_2}=\frac{(9.13\cdot 10^3)(3.15 m/s)}{4.93\cdot 10^3}=6.85 m/s

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3 years ago
When physical activity is a set plan or program for all ages, usually performed by a group through a local recreational unit, it
Alexeev081 [22]

Answer:

C. Sports activity

Explanation:

A sport activity is a form of competitive physical activity in forms of games. They are normally organized for individuals to participate  with the aim of improving physical abilities and skills, bring enjoyment to participants and act as a form of entertainment.

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3 years ago
Renald completed only one trial of his experiment. what effect will this most likely have?
Tatiana [17]
Remember the rule of thumb that every person learns in Elementary Science? You must do multiple experiments in order to get to a conclusion. In order for a conclusion to be valid you must test the conclusion multiple times. You wouldn't want a doctor to just test an aspirin 1 time on 1 patient and say yes it works correct? No, you would want him/her to test on multiple patients in multiple settings and conditions so that when you take an aspirin you know that it will work for what you are taking it for. So ..... with all that being said.....Your answer is (A). The results are more likely to have errors. 
6 0
3 years ago
Ron weighs a bottle with a mass of 0.5 kilograms on a spring scale. The spring stretches by 1 centimeter. He then weighs a secon
Yuri [45]

Answer:

1 kg

Explanation:

Applying,

Hook's law,

F = ke................. Equation 1

Where F = force, k = force constant of the spring, e = extension.

But from the question,

The weight of the bottle is the force acting on the spring scale

therefore,

mg = ke............ Equation 2

Where m = mass of the bottle, g = acceleration due to gravity.

make k the subject of the equation

k = mg/e............ Equation 3

Given: m = 0.5 kg, e = 1 cm = 0.01 m

Constant: g = 9.8 m/s²

k = (0.5×9.8)/0.01

k = 490 N/m

If the mass of the second bottle is weighed,

given: e = 2 cm = 0.02 m

subtitute into equation 1

m×9.8 = 490×0.02

9.8m = 9.8

m = 9.8/9.8

m = 1 kg.

Hence the mass of the second bottle is 1 kg

5 0
3 years ago
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