Computation. On earth, a block sitting on a frictionless, horizontal table accelerates at 7.13 m/s² when a 21-N horizontal force is applied to it. The block and table are then moved to the moon where the acceleration due to gravity is 1.64 m/s². Find the magnitude of the block's weight wm on the moon. Wm - N D Record your numerical answer below, assuming three significant figures.
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- Two forces act on a 2.90 kg object, the gravitational force and a second, constant force. The object starts from rest and in 1.20 s is displaced (4.10 3.30ĵ) m. Write the second force in unit vector notation. (Enter your answer in kg. m/s². Assume the gravitational force acts in the -ĵ direction.) kg. m/s² F9. Consider the falling object of mass 10 kg in Example 2, but assume now that the drag force is proportional to the square of the velocity. a. If the limiting velocity is 49 m/s (the same as in Example 2), show that the equation of motion can be written as 1 (49² - 1²). 245 dy dt Also see Problem 21 of Section 1.1. b. If y(0) = 0, find an expression for v(t) at any time. Gc. Plot your solution from part b and the solution (26) from Example 2 on the same axes. d. Based on your plots in part c, compare the effect of a quadratic drag force with that of a linear drag force. e. Find the distance x(t) that the object falls in time t. Nf. Find the time T it takes the object to fall 300 m.Calculate the final speed of the 2.00-kg object that is pushed for d =25.0 m by the F = 50.0 N force on a level, frictionless floor (see the figure below). Assume the object starts from rest. V = ? 2 kg at rest $20° F d 2 kg 1) Calculate the final speed. (Express your answer to two significant figures.) S
- I forgot my car in a no - parking zone. A tow truck pulled it away. The truck exerted a force of 4000 N on my car. There was friction between the car’s tires and the ground, and the force of friction was 600 N. My car was moving with an acceleration of 2 m/s2. What is the mass of my car? Write the solution to this question showing all the steps. Do not forget the units on your final answer.(Type only the letter of the correct answer) A Ferris wheel has a diameter of 90 m. It makes one revolution every 60 seconds. a. Find the speed of the passengers when the Ferris wheel is rotating at this rate. Choices: a.) 3.04 m/s b.) 6.12 m/s c.) 4.71 m/s d.) 5.08 m/s Ans.: b. A passenger weighs 882 N at the weight- guessing booth on the ground. What is his apparent weight (normal force) at the highest point on the Ferris wheel? Choices: a.) 838 N b.) 926 N c.) 862 N d.) 983 N Ans.:Two forces act on a 2.50 kg object, the gravitational force and a second, constant force. The object starts from rest and in 1.20 s is displaced (5.50î – 3.30j) m. Write the second force in unit vector notation. (Enter your answer in kg · m/s. Assume the gravitational force acts in the -ĵ direction.) kg · m/s2 II
- A block with a mass (m) of 74.7 kg slides along a horzontal surface. the coefficent of kinetic friction is .31. THe block has an ititial speed (v0) at 11.6m/s in the positive direction. 1) write and expression for the x component of the frictional force of the block experiences Ff in terms of the given variables and variables avaible. 2) what is the magnitude of the frictional force? 3) how for will the block travel before coming to rest.d. Force is a vector quantity and thus has both a magnitude and a direction. A vector can be represented graphically by a line drawn to scale in the direction of the line of action of the force. To distinguish between vector and scalar quantities, various ways are used. Identify and explain threeof these ways.Question 9 Figure shows the velocity graph of a 65 kg student in an elevator. What is the student's apparent weight (magnitude only) att=8.0 s, in Newtons? Use g = 10.0 m/s2. Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. (No unit is'needed in your answer, it is already given in the question statement,) Vy (m/s) 8- 4 t (s) 10 4. 6. 8.
- Figure shows the velocity graph of a 65 kg student in an elevator. What is the student's apparent weight (magnitude only) at t = 7.0 s, in Newtons? Use g = 10.0 m/s². (Hint: What is the net force?) Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. Vy (m/s) 8- 4- (s) 10 4. 6. 8.A runaway train car that has a mass of 1.68e+4 kg travels at a speed of 7.60 m/s down a track. Compute the time required for a force of 1.57e+3 N to bring the car to rest. a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 ....sA 100 car train is pulled by a 200T locomotive. Assume that the cars are all identical and weigh 100T each. The train accelerates from 0 - 10m/s in 200s, and we ignore friction and air resistance. Roughly sketch this train as a single object (you don't have to sketch all 100 cars). - What is the mass of the entire train (in Tonnes and kg)? - What is the train's acceleration in m/s^2? - What is the (tractive) Force supplied against the rails by the locomotive in N and kN to accelerate the train? - What is your day of birth (dd)? This is your car number counting back from the locomotive. - Draw the FBD for your single car on this train while it is accelerating, and briefly explain forces. - Find weight and normal force (magnitude and direction) for your car, add these to the FBD. - Calculate the forward coupler tension (magnitude and direction for the attachment point of your car to the forward part of the train pulled by the locomotive) for your car, add to the FBD, and explain.