Which of the following describes bias in an experiment? A. When researchers draw conclusions that do not support the hypothesis.

B. When researchers draw conclusions that are consistent with their observations.

C. When researchers blind themselves to participants in the groups, so they don't accidentally reveal the information.

D. When the personal opinions, Ideas, or judgments of the researchers influence their research.

C

Explanation:

It's c because typically, scientists research something based on their opinions all of the time, so it can't be d. If a scientist is satisfied with their observations then, that's not bias. It's not b. If they make a hypothesis, an it turns out wrong, and then they draw conclusions because they found a different answer, that's not bias. It's not A. The only answer left would be c. They don't want to reveal the information because they are bias about their own opinions.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.