4. one joule per second is equal to one---
5. Joules per second is an alternative unit use for expressing----
6. A typical bicycle is a --- machine
7. When Ma>1 the machine effort force is ---- than the resistance force.
8. A landscaper pushes a lawnmower a distance of 60 m using 80 N of force. The angle of the lawnmower handle with respect to the ground is 45 degree. How much work is done by the landscaper?
my answer are please check if i am correct.
4. watt
5. watt
6. comound
7. greater
8. 3.394 J
4. watt
5. POWER
6. COMPOUND
7. LESS
8. 3.394 J are you in Europe? IN USA we write 3,394 J with a comma for thousands
1. Regarding question 4, you are correct. One joule per second is equal to one watt. This relationship is based on the definition of power, which is the rate at which work is done or energy is transferred. The watt is the unit of power in the International System of Units (SI).
2. In question 5, you are also correct. Joules per second (J/s) is an alternative unit used for expressing power. As mentioned before, power represents the rate of energy transfer or work done per unit of time. It can be measured in joules per second, which equals watt.
3. However, in question 6, the correct answer is a simple machine. A typical bicycle is an example of a simple machine, specifically a lever and wheel, which uses mechanical advantage to multiply force or change the direction of force.
4. Moving on to question 7, you are correct again. When the mechanical advantage (Ma) is greater than 1, it means that the machine effort force is greater than the resistance force. This implies that the machine is capable of exerting a larger force than the force opposing it.
5. Finally, let's evaluate question 8. Your answer, 3.394 J, is not correct. To determine the work done by the landscaper, we need to calculate the product of force and displacement. The formula for work done is:
Work = Force × distance × cos(angle)
In this case, the force is 80 N, the distance is 60 m, and the angle is 45 degrees. To calculate the work, we need to convert the angle to radians by multiplying it by (π/180).
Work = 80 N × 60 m × cos(45° × π/180)
= 4800 Nm × cos(0.7854)
≈ 3393.03 Joules
Therefore, the correct answer is approximately 3393.03 Joules.