I think the correct answer from the choices listed above is the last option. All of the above given choices is part of the kinetic theory of gases. In this theory, particles of a gas move independently of each other, particles in a gas move rapidly and particles in a gas are relatively far apart.
Whoa, whoa... settle down there. We'll sort you out.
All of your questions in life can be solved using one simple formula:
F = m*a
In english, this is
Force = (mass)*(acceleration)
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[1] Let's identify the mass. Kg (kilograms) is a mass unit, so we know that
m = 40.
The acceleration is a = 10 m/s^2.
The question is, is the force 400 N? Let's check against the formula:
F = m*a
F = (40 kg)*(10 m/s^2)
F = 400 kg*m/s^2
F = 400 N
Yes. The answer is true.
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[2] The mass is m = 60 kg. The acceleration is a = 2.0 m/s^2. The force is
F = m*a
F = (60 kg)*(2.0 m/s^2)
F = 120 kg*m/s^2
F = 120 N.
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[3] The mass is m = 30 kg. The force is 180 N. Ah, this is a little different, now we don't know the acceleration. But the same formula works:
F = m*a
180 N = (30 kg)*a
180 N / 30 kg = a
6.0 m/s^2 = a
The acceleration is 6.0 m/s^2.
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[4] This is a hypothetical question. Suppose we know the force F and the acceleration a, but we don't know the mass m. I'll put m in a box [m] so that we remember that this is the one we don't know. The same formula works:
F = m*a
F = [m]*a <--- m is the one we don't know
F / a = [m]
In reality, we would have numbers for F and a, but since we are just pretending we are done!
m = F/a is the formula.
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See? Not too bad. :)
Answer:
B, C and D are true.
<h3>Explanation:</h3>
A is false because they appear a pale reddish colour not purple.
Answer:
12 Ohms
if all resistor are the same, use resistance=resistor * # of resistors.
Answer:
A. recycling allows resources to be reused, instead of dumped in landfills.
Explanation: