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3 years ago

Should the hypothesis always be correct for a conclusion

1 answer:

4 0

No it shouldn't, a hypothesis doesn't need to be correct but must have an idea for why x variable effects y variable and have good reasoning. In the conclusion you should state if it's correct or not and explain why it's correct/incorrect and what answer you've determined from data.

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When a 1.0-kilogram cart moving with a speed of

neonofarm [45]

The type of collision in this system is called inelastic collision where after collision the two objects stick together. We can solve for the final velocity after collision by the expression:

v = m1v1 + m2V2 / (m1+m2)

v = 1(0.50) + (1)(0) / (1+1) = 0.25 m/s

Therefore, option 3 is the correct answer.

4 0

3 years ago

Read 2 more answers

Se lanza una pelota de hule elástica de masa mA con una velocidad VAi contra la puerta trasera de un camión muy pesado de masa m

miv72 [106K]

Answer:

$v_{A}=v_{Ai}$

Explanation:

The total momentum of the system must conserve by the law of momentum conservation.

$p_b=p_a\\\\m_Av_{Ai}+m_Bv_{Bi}=m_Av_{A}+m_Bv_{B}$ ( 1 )

If you consider the shock between the ball and the truck as totally elastic, and also if the truck is much more massive than the ball, you can assume that the truck does not move when the ball hits it.

Then the truck is always at rest

Hence, you have in the expression ( 1 ):

$m_Av_{Ai}+0=m_Av_{A}+0\\\\v_{Ai}=v_{A}$

3 0

3 years ago

A camera weighing 10 N falls from a small drone hovering 20 m overhead and enters free fall. What is the gravitational potential

Mashcka [7]

Answer:

A) 200 j

B) 0 J

C) -100 J

D) -300 J

Explanation:

We know that change in potential energy is given as

$\Delta U = U_f - U_i = mgy_f - mgy_i$

where, mg is weight

yf and yi final and initial position

mg = 10 N

yf = 0 m

yi = 20 m

$\Delta U = 10\times 20 - 0 = 200 J$

B) mg = 10 N

yf = 20 m

yi = 20 m

$\Delta U = 0 j$

c) before fall from the drone

U = mgh

h = yf - yi = 20 - 30 = -10 m

$U = 10\times (-10) = -100 J$

D) point has 0 potential energy

mg = 10 N

h = yf -yi = 0 -30 = - 30 m

$U = 10 \times (-30) = -300 J$

3 0

3 years ago

A car started to move ftom the rest and covers 2 km distance producing an acceleration of 0.5m/s2 find its velocity how long tim

Andreas93 [3]

(a) 44.7 m/s

We can find the final velocity of the car by using the SUVAT equation:

$v^2-u^2 = 2ad$

where

v is the final velocity

u = 0 is the initial velocity (the car starts from rest)

$a=0.5 m/s^2$ is the acceleration

$d=2km = 2000 m$ is the displacement

Solving for v,

$v=\sqrt{u^2 +2ad}=\sqrt{0+2(0.5)(2000)}=44.7 m/s$

(b) 80 s

We can find the time it takes for the car to cover 1.6 km by using the following SUVAT equation:

$d=ut+\frac{1}{2}at^2$

where in this case we have

d = 1.6 km = 1600 m is the displacement

$a=0.5 m/s^2$ is the acceleration

u = 0

t is the time

Solving for t, we find:

$t=\sqrt{\frac{2d}{a}}=\sqrt{\frac{2(1600)}{0.5}}=80 s$

8 0

3 years ago

Sir Isaac Newton determined that gravity has a fixed acceleration on Earth. The earth pulls objects towards it with a fixed acce

ozzi

A. Scientific Law. The mathematics surrounding the acceleration due to gravity is a law. It is calculated from the universal law of gravity. However, the explanation of the idea of gravity is a theory. This falls back to the idea that science is about disproving ideas that we currently believe, rather than proving ideas are correct. Unless we can disprove an idea, we have to accept the possibility that it is true; the more trials we have of being unable to disprove something, the more accepted it will be. Yet, no idea can be without doubt and certainty be accepted for what it is. So, to sum it up, scientific laws are factual descriptions (by formula or word) of phenomenon which always occur given specific conditions. On the other hand, scientific theories are explanations of the causes underlying these phenomena, the explanation formulated in such a way that they can be disproven.

3 0

3 years ago

Read 2 more answers