Answer:cart B
Explanation:
For cart A speed is constant therefore there is no acceleration because acceleration is rate of change of velocity
thus there is no net force
For cart B there is change in velocity in the left direction , so there is net acceleration towards left
so there is net force in the left direction
For cart C there is decrease in velocity i.e. negative acceleration or deceleration . Therefore there is a net force towards right which opposes the motion
Answer:
The answer for the first question is: 3,000,000 N/m
The answer for the second question is: If the question was, "Which of the following is the best example of kinetic energy being transformed into potential energy?" then the answer is winding the spring on a toy car
Explanation:
For the first question: I have no explanation, I just got it right on my test so I thought i'd help you out.
For the second question: (i'll try to explain the best I can).
Kinetic energy = energy in motion
Potential energy = stored energy
so when winding the spring of a car you are using energy in motion (kinetic energy) to create stored energy (potential energy) that will be used to move the car. So it goes something like:
kinetic energy > potential energy > kinetic energy
The threshhold for gamma rays is between 1 * 10^17 Hz and 9*10^17 Hz
Since this question goes much beyond that the answer is you much be working with a gamma ray. It is "Best" classified this way because nothing else will fit. The others are all much lower.
Answer:
The correct answer is option D, Using an Electric mixer ( i hope this is the correct answer to what you are talking about because you didn't have any options but i gave out almost the same question to my students.)
Explanation:
Physical fitness is assured by activities in which our body is doing some kind of physical movements or exercise. In case of “walking to work “ the body is compelled to move or walk, in case of “carrying boxes up and down stairs” lot of physical work is done in both carrying the boxes and moving up and down the stairs, in the same way in case of “shoveling snow” some physical efforts are required to shovel the snow. But in case of using a electric mixer, the only work being done is the “pressing of ON/OFF button”. Thus , "using an electric mixer" will have the LEAST effect on your level of physical fitness