4 years ago

When must scientific theories be changed?

2 answers:

4 0

Surprises are the reason there are new discoveries. We should clap our hands when we get a surprising result from an experiment.

Governments? What do they have to do with science unless they are funding the project. If they are not, science and governments do not really mix.

Well that has happened, but I don't think that's the answer.

D is your answer.

vlada-n [284]4 years ago

3 0

D because when new evidence is found other question will come up about it

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A 100 kg mass is pulled along a frictionless surface by a horizontal force F such that its acceleration is 8.0 m/s2. A 20 kg mas

nadya68 [22]

Answer:

a) 60 N

b) 860 N

Explanation:

Given that,

$m_1$ = 100 kg

$m_2$ = 20 kg

$a_{1}$ = 8.0 $\frac{m}{s^{2}}$

$a_{2}$ = 3.0 $\frac{m}{s^{2}}$

a) By Newton's Law,

∑ $F_{m_2,x} = f_k = m_{2} * a_{2}$

∑ $F_{m_2,y} = F_{N} - m_{2} * g = 0$

Hence,

$f_k = m_2 * a_2 = 20 * 3 = 60 N$

b) By Newton's Law

∑ $F_{m_1,x} = F = m_{1} * a_{1}$

Hence,

$F = m_{1} * a_{1} = 100 * 8 = 800 N$

Net force acting on 100 kg mass,

$F_{net} = F + f_k = 800 + 60 = 860 N$

6 0

3 years ago

Ork is done if a boat has a force 60N and travels 600 meters

Travka [436]

Answer:

This is the answer.

Explanation:

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2 years ago

Hot air balloon with a kinetic energy of 76550J and a mass of 1890kg.<br> what’s the velocity?

lukranit [14]

Answer:

$K.E = \frac{1}{2} m {v}^{2} \\ 76550 = \frac{1}{2} (1890) {v}^{2} \\ {v}^{2} = \frac{76550}{945} \\ = 81.005 \\ v = \sqrt{81.005} \\ v \approx \: 9m. {sec}^{ - 1}$

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3 years ago

how much energy is transferred when 1 gm of boiling water at 100 degree celcius condenses to water at 100 degree celcius?

Mademuasel [1]

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4 years ago

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On which surface would the toy car travel the farthest?

7nadin3 [17]

Answer:

ice

Explanation:

If the toy car is on a smooth surface, there is less friction. Therefore, the car will most likely go faster. Ice has the least friction so the toy car would travel fast.

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3 years ago

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