A cart that rolls with low friction on a track is originally at rest. It is given a brief push, and it coasts a long distance along a track in the +x direction, slowly coming to a stop. Study graphs (A) - (C) below, which do not have the vertical axes labeled. One is a position (x) versus time graph, one is a momentum (px) versus time graph, and one is a net force (Fnet,x) versus time graph. Label the vertical (y-) axis of each of the graphs, and explain how you made your determination. (A) (B) (C) t
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- Calculate the object's change in velocity between positions A and B. Include direction. Round to the nearest whole number. DO NOT include units. Л. В. D. 3 kg 3 kg v = 2 m/s 3 kg 3 kg Point A and B [AandB] v= 5 m/s v =0 m/s v=-4 m/s Above shows an object at different positions,デジタル形式で段階的に解決 ありがとう!! SOLVE STEP BY STEP IN DIGITAL FORMAT An empty 15,000-kg cargo truck travels down a flat track at 5.00 m/s. Suddenly, 5,000 kg of coal are dropped into the truck, directly from the amoeba. Initially, the velocity of the coal in the horizontal direction is zero with respect to the ground. Find the final speed of the truck. Ans. 3.75 m/s.Scenario #2: It's Rocket Science This problem is all about rockets! Assume the rocket mass is 2 × 104 kg (20,000 kg) for this scenario. Multiple Choice Questions The acceleration of a rocket is complicated. The thrust force and the mass of the rocket change as fuel is burned and ejected. Model this time-varying acceleration for the rocket as a() = († /kr) ³ kt where ß = 2.5 m/s² and k = 0.01 s¹. Ignore all forces except thrust and gravity. 3) What is the thrust force magnitude at t= 30 s? Hint, you must consider gravity. a) 1.2 x 105 N c) 3.3 × 105 N d) 4.2 x 105 N b) 2.7 x 105 N 4) If the rocket starts from rest at t = 0 s, what is its velocity at t = 30 s? a) 0 m/s f c) 75 m/s f d) 89 m/s j b) 2.5 m/s f e) 5.6 x 105 N f) 8.8 x 105 N e) 107 m/s f f) 294 m/s f Short Answer Question Before launch, the rocket (m = 2 x 104 kg) rests on the ground and is partially supported by two cables attached to the launch platform. The cables make an angle of 35⁰ from vertical as shown and cable has a…
- Your answer is partially correct. Flying Circus of Physics A man of mass 71 kg drops to a concrete patio from a window 1.2 m above the patio. He neglects to bend his knees on landing, taking 2.8 cm to stop. (a) What is his average acceleration from when his feet first touch the patio to when he stops? (b) What is the magnitude of the average stopping force exerted on him by the patio? (a) Number (b) Number 420.04 29822.8 Units Units m/s^2 NThe force on an object moving through a viscous fluid (like honey) is F = -bv, where v is the speed of the object. What are the SI units of b? O kg/s kg/s² kg/m O kg/m² O kg/m · s O none of thesePlease answer the question correctly
- In this problem, we will consider the following situation as depicted in the diagram: A block of mass m slides at a speed v along a horizontal smooth table. It next slides down a smooth ramp, descending a height h, and then slides along a horizontal rough floor, stopping eventually. Assume that the block slides slowly enough so that it does not lose contact with the supporting surfaces (table, ramp, or floor). You will analyze the motion of the block at different moments using the law of conservation of energy. A B y=0 C a. Which word in the statement of this problem allows you to assume that the table is frictionless? b. Where (letter) would the block have the greatest gravitational potential energy? c. Where (location) would the block experience the greatest kinetic energy?A student throws a 110 g snowball at 8.5 m/s at the side of the schoolhouse, where it hits and sticks. ▼ Part A What is the magnitude of the average force on the wall if the duration of the collision is 0.19 s? Express your answer with the appropriate units. F=-3.68 Submit HA Provide Feedback N ? Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Next >2.3. A train car is sitting on a level track when a second car moves in. The second car hits the first, their hitches engage, and they move together. Both cars have equal masses of about 120 000 kg, and the second car initially has a velocity of 1.5 m/s. (a) Draw a diagram that illustrates the situation and include an arrow representing the velocity vector of the second car and a separate arrow representing ĉ, the unit vector for the coordinate system along the tracks. (b) Write vector expressions for both the velocity and momentum of the second car using at least two forms of vector notation that have been covered in class. (c) Just before the collision, what is the velocity of the center of mass of the system that includes both cars? Again, express this as a vector. (d) Just before the collision, what is the total kinetic energy of the system that includes both cars?
- Question 1: A bullet of mass m hits a block of mass M on a table with velocity vo as shown in the figure below. The bullet embeds in the block. The friction coefficient between the block and the table poxez² where .2 is u = is a constant and 0+ Algebraic manipulation. Two automobiles traveling at right angles to each other collide and stick together. Skid marks show the wreckage was traveling 21° from the original direction of car A. Find the original speed of car B in terms of car A's original speed (VA) if their masses are related by ßmд where ß =1.9. Fill in the missing factor below. MB UB VA Record your numerical answer below assuming three significant figures. Remember to include a "-" when necessary. HOLDeQuestion 3. The cart shown in figure below moves with constant deceleration changing the speed from v0 = 5 m/s to v1 = 1 m/s. After 2 seconds when it reaches the speed v1 it suddenly stops. Write the displacement of the mass as a function of time. Mass m moves without friction on the surface of the cart. Assume positive direction from left to right (direction of motion of the cart). Numerical values: m = 2 kg, k = 1.152 kN/m. V k Ans: x(t) = 3.472 cos 24 t + 41.6 sin 24 t (mm) m LSEE MORE QUESTIONS