A 0.2-kg rubber egg bounces off an actor's roof, remaining in contact with it for 43 ms while changing the egg's velocity from 24.5 m/s directly toward the roof to 13.5 m/s directly away from it. Find the magnitude of the average force applied to the egg by the roof. (Be careful with units!) Fav - N
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- The 1-1b ball A is thrown so that when it strikes the 10-lb block B it is traveling horizontally at 20 ft/s as shown in (Figure 1). Figure 20 ft/s A B 1 of 1 Part A Determine the average normal force exerted between A and B if the impact occurs in 0.03 s. The coefficient of restitution between A and B is e = 0.6. Express your answer in pounds to three significant figures. F = IVE ΑΣΦ Submit Provide Feedback ↓↑ vec Request Answer ? lb Next >Learning Goal: To understand the relationship between force, impulse, and momentum. The effect of a net force EF acting on an object is related both to the force and to the total time the force acts on the object. The physical quantity impulse J is a measure of both these effects. For a constant net force, the impulse is given by J = FAt. The impulse is a vector pointing in the same direction as the force vector. The units of J are N. sor kg · m/s. Recall that when a net force acts on an object, the object will accelerate, causing a change in its velocity. Hence the chiect's momentum in- mail will also change. The Figure F (N) L 12,000 0.0007 1 of 1 t (s) In Parts A, B, C consider the following situation. In a baseball game the batter swings and gets a good solid hit. His swing applies a force of 12,000 N to the ball for a time of 0.70 × 10-³ s. Part A Assuming that this force is constant, what is the magnitude J of the impulse on the ball? Enter your answer numerically in newton…PHYSICS! WRITE THE COMPLETE SOLUTIONS LEGIBLY. NO LONG EXPLANATION NEEDED. UPVOTE WILL BE GIVEN! MULTIPLE CHOICE During a collision with a wall, the velocity of a 0.200-kg ball changes from 20.0 m/s toward the wall to 12.0 m/s away from the wall. If the time the ball was in contact with the wall was 60.0 ms, What was the magnitude of the average force applied to the ball? a.13.3 N b.40.0 N c.107 N d.16.7 N e.26.7 N
- A crane drops a 1.7 kg steel ball onto a steel plate. The ball’s speeds just before impact and after are -8.5 m/s and 5.3 m/s, respectively. If the ball is in contact with the plate for 0.048 seconds, what average force does the ball exert on the plate during impact? ROUND TO 3 DECIMAL PLACESFlying Circus of Physics The high-speed winds around a tornado can drive projectiles into trees, building walls, and even metal traffic signs. In a laboratory simulation, a standard wood toothpick was shot by pneumatic gun into an oak branch. The toothpick mass was 0.140 g, its speed before entering the branch was 217 m/s, and its penetration depth was 18.0 mm. If its speed was decreased at a uniform rate, what was the magnitude of the force of the branch on the toothpick? Number i Units ◊For a ballistic study, a 1.9 g mass bullet is fire into softwood. The bullet strikes the wood surface with a velocity of 380m/s and penetrates 0.15m. Find the time required to stop the bullet in seconds. Express your answer in 5 significant figures. Draw the diagram.
- A stationary soccer ball of mass m = 0.72 kg is kicked with a constant force of F = 29 N. The woman's foot is in contact with the ball for t = 0.24 s a) Write an expression for the speed of the ball, vi, as it leaves the woman's foot. (b) What is the velocity of the ball right after contact with the foot of the woman?Use vectors to solve the following problems. Both cars weigh 1500 kg. Use the scale 1 cm = 1,000 kg x m/s. Assume all collisions to be elastic and sticking. Draw a picture represents the problem too. The first car is travelling at 20 m/s east. The second car is travelling at 30m/s north. Using vectors draw to scale the component vectors and the resultant from their collision. Then solve using your trigonometric functions. Also: use Pythagorean TheoremA 90 N net force acts right on a 6 kg object. If the initial velocity of the object is 10 m/s right, then what is the final velocity of the object after the net force has acted through a displacement of 20 m right?
- For a ballistic study, a 1.9 g mass bullet is fire into softwood. The bullet strikes the wood surface with a velocity of 380m/s and penetrates 0.15m. Find the constant retarding force in N. Express your answer in 5 significant figures. Draw the diagram.During a collision with a wall, the velocity of a 0.11-kg ball changes from 29 m/s toward the wall to 17 m/s away from the wall. If the time the ball was in contact with the wall was 95 ms, what was the magnitude of the average force applied to the ball?Assume that the sum of any external forces acting on the system is zero. Note: The arrows are just supposed to show the direction of the car's movement. They do not represent the magnitude of the velocity. 1) Find the final velocity of the car on the right hand side. Before the Collision: V=2 m/s V=-2 m/s 1kg 2kg After the Collision: V=? 2kg V=-1 m/s 1kg