- A person Uses a 20-cm-long wrench to tum a not. The wrench handle is tilted 30° above the horizontal and the person pulls straight down on the end with the porce of 100N · How much moment does the person exert on the nut?
Can someone please explain how to do this? A babysitter pushing a stroller starts from rest and accelerates uniformly at a rate of 0.778 m/s^2. What is the velocity of the stroller after it has traveled 5.54 m?
A caterpillar tries to climb straight up a wall two meters high, but for every 2 cm up it climbs, it slides down 1 cm. Eventually, it reaches the top. When it reaches the top, it does not pull itself over so it will slide down 1 cm. At this point, the caterpillar was exhausted and fell to the ground. What is the total displacement? In the first box, select the total displacement. In the second box, indicate the direction whether up, down or n/a.
Light travels approximately 982,080,000 ft/s, and one year has approximately 32,000,000 seconds. A light year is the distance light travels in one year. State the speed in mi/s, using scientific notation. (1 mile = 5280 feet exactly, by definition; i.e., this is not a measurement.)
A lorry travels 10km northwards, 4km eastwards, 6km southwards and 4km westwards to arrive at point T. What is the total displacement?
The figure below shows a gas jar Q containing nitrogen oxide gas which is brown in colour and is denser than air and a jar P which contains air. When the cover R is removed, nothing visible happens in the first few minutes (about 10 minutes)(a) Explain why nothing visible happens in the first few minutes. (b) Explain what you would observe after, say 30 minutes? What do you think will have happened.
The place kicker on a football team kicks a ball from ground level with an initial speed of 8.40 m/s at an angle of 21.0° above the horizontal. How long is the ball in the air, in seconds, before it lands on the ground again? You may neglect air resistance.
Look at the ripple tank below. A class is using it to observe water waves. Three students count the number of waves that pass a point in 10 seconds. Valerie counts 27 waves, Stu counts 28 waves and Benjamina counts 30 waves. What is the average of the three counts? Give your answer to one decimal place
A steel bar has a width of 10 cm at 50oC At what temperature will it fit exactly into a hole of constant width 10.005 cm if coefficient of linear expansion of steel is 11x10-6 C-1)? A. 75oC B. 0.005oC C. 75.5oC D. -75.50C
A coin of thickness x is half immersed in a liquid of surface tension T. Circular surface of the coin is vertical. Angle of contact between liquid and metal with which coin is made is 60°. If radius of the coin is r, surface tension force on coin by liquid is,(1) 4T(2r + x) upwards (2) 4T(2r + x) downwards (3) 2T(2r + x) upwards (4) 2T(2r+x) downwards (5) T(2r + x) downwards
Water flows out of the hose at a speed of 5 meters per second. What will be the outflow velocity if the tip of the hose is pressed so that the cross-sectional area is reduced by 3 times?
You throw a ball straight up with a velocity of 25 m/s. How high will it reach before it begins falling back down? How long will it take to come back down and hit you on the head? How fast will it be going?
You are skiing and you push off from the top of the hill, giving yourself an initial velocity of 1 m/s. You accelerate down the hill at a rate of 2 m/s/s. What will your speed be after 10 seconds? How far will you have traveled after 10 seconds?
