Hi!
The correct option would be C.
<h3>Explanation:</h3>
Scientific method is the protocol in an experiment for a hypothesis that involves testing, measurement, observation and necessary modification of hypothesis during the course of the experiment. There are several manners and experiments that can be tested for the hypothesis, and plenty of ways to design an experiment.
Scientific experiments can be very tricky to design, owing to the numerous parameters and variables that need to be accounted for. Of course, there are some relatively simple experiments. Creativity is needed for all branches of science, because each field presents obstacles in discovery, and creativity allows for us to devise ways around those obstacles. Science has always tested humans ability to think outside the box and question their surroundings, and creativity has been the driving force.
Hope this helps!
Lifting a 50-kg sack through a vertical distance of 2 m requires same amount of work as lifting a 25-kg sack through a vertical distance of 4 m
<h3>How to determine which will require more work</h3>
To determine which will require more work, we shall determine the work done in lifting each sack. Details below:
i. Work done in lifting 50 Kg
- Mass (m) = 50 Kg
- Height (h) = 2 m
- Acceleration due to gravity (g) = 9.8 m/s²
- Workdone (Wd) =?
Wd = mgh
Wd = 50 × 9.8 × 2
Workdone = 980 J
ii. Work done in lifting 25 Kg
- Mass (m) = 25 Kg
- Height (h) = 4 m
- Acceleration due to gravity (g) = 9.8 m/s²
- Workdone (Wd) =?
Wd = mgh
Wd = 25 × 9.8 × 4
Workdone = 980 J
SUMMARY
- Work done in lifting 50 Kg is 980 J
- Work done in lifting 25 Kg is 980 J
Thus, equal amount of work done is needed.
Learn more about workdone:
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Answer:
B.) if statistical results are significant
Explanation:
If a scientist accepts the null hypothesis, then there is enough evidence to reject the null hypothesis.
This means that the p-value is less than the significance level.
When the scientist accepts the alternative hypothesis, it means the statistical results are significant.
The correct answer is B.
So obviously the 20N pulls more than the 5N. Friction opposes direction of motion, so the 5N opposes the 20N and the two forces are against each other.
Net force would be in the direction of the 20N force: 20N - 5N = 15N.
Force = mass*acceleration
15 = (5)*acceleration
acceleration = 3m/s^2