Question
A person riding a bike at 15 mph is in an accident. They are wearing a helmet. How does the padding in the helmet reduce injury to the cyclist? Select all that apply.
A. The padding in the helmet reduces the change in kinetic energy of the head which decreases the force exerted on the head.
B. The padding in the helmet increases the stopping distance of the head which decreases the force exerted on the head.
C. The padding in the helmet increases the stopping time of the head which decreases the force exerted on the head.
D. The padding in the helmet reduces the change in momentum of the head which decreases the force exerted on the head.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution
Trending nowThis is a popular solution!
Step by stepSolved in 2 steps
Knowledge Booster
Similar questions
- What does it mean for an object to be more elastic? O if the object offers more resistance to the deforming force and returns back to its original shape quickly after the force is removed O if the object offers less resistance to the deforming force and returns back to its original shape after the force is removed O if the object offers less resistance to the deforming force and returns back to its original shape slowly after the force is removedarrow_forward1. A carnival ride consists of a hollow cylinder spinning about a vertical axis. As the cylinder spins with a speed vo, a person of mass M rides the inside wall of the cylinder without slipping down (there is no floor). The distance of the center of mass of the person from the axis of the cylinder is R. a. Draw the free body diagram of forces acting on the person during the ride. Show your choice for the +x and +y directions. b. Write out Newton's 2nd law in the x and y directions. Set the RHS of the equations to zero or Mv²/R or –Mv²/R. X: y: c. What is the normal force? d. What is the magnitude and direction of the friction force that the wall exerts on the rider? e. What is the magnitude and direction of the friction force the rider exerts on the wall? f. The coefficient of static friction between the wall and the rider is µg. What is the minimum speed that the rider can move without slipping down the wall?arrow_forwardView Policies Current Attempt in Progress Multiple-Concept Example 5 reviews many of the concepts that play a role in this problem. An extreme skier, starting from rest, coasts down a mountain that makes an angle of 29.7° with the horizontal. The coefficient of kinetic friction between her skis and the snow is 0.156. She coasts for a distance of 18.8 m before coming to the edge of a cliff. Without slowing down, she skis off the cliff and lands downhill at a point whose vertical distance is 4.24 m below the edge. How fast is she going just before she lands? Number i eTextbook and Media Save for Later Units Attempts: 0 of 5 used Submit Answerarrow_forward
- 7. Conceptual question: A block is given an initial push and is sent up an incline plane as shown. You time the trip up to its maximum point up the plane, and again time the trip down the plane (on its way back). To your surprise, the time "down" is longer than the time "up". Explain: Note that the plane has friction. What would you expect if the plane was frictionless?arrow_forwardQuestion 10 A 10.0 kg child on a 5.0 kg sled, starting from rest, goes down a frictionless hill with a height of 3.25 m. As soon as it reaches the bottom of the hill the sled hits a gravel patch on level ground with a coefficient of friction of 0.72. How far does the sled travel before coming to a stop? (1017) A) 02.34 m B) 067.71 m C) 00.16 m D) 035.10 m E) 04.51 marrow_forwardA 2.0 kg particle moving along the x-axis experiences the force shown in (Figure 1). The particle's velocity is 3.0 m/s at x=0 m. At what point on the x-axis does the particle have a turning point?arrow_forward
- Two blocks with different mass are attached to either end of a light rope that passes over a light, frictionless pulley that is suspended from the ceiling. The masses are released from rest, and the more massive one starts to descend. After this block has descended a distance 1.40 m , its speed is 3.00 m/s. If the total mass of the two blocks is 18.0 kg, what is the mass of the more massive block? Take free fall acceleration to be 9.80 m/s2.arrow_forwardQuestion 11 Use the following information to answer the next question. Curling Rocks A 19.6-kg curling rock moving at 2.00 m/s [North] strikes another curling rock off-centre. The first rock then moves off with a velocity of 0.900 m/s [45° W of N]. Assume the ice is frictionless and there is no spin on the incoming rock. What percentage of kinetic energy is retained in this system? OOO O 46% O 76% O 67% O 92%arrow_forwardGravitational Energy Conservation A "super cannon" launches a ball vertically from Earth's surface with a speed of v. Ignore air resistance and the Earth's spin. At its highest point, the ball is a height of h above the surface of the Earth. Earth's mass is 5.97 x 1024 kg. Earth's radius is 6.37 × 106 m. 7 ย m S 8 Type your answer... v 6,002™ S Type your answer... h 1.89×106m h x10m -arrow_forward
- * TWO friends at rest decide to start add pushing off against each other on an icy smooth surface with no friction.. The first person weight is 675 N and the second is 725 N. A Assume the heavier person travels to the right at 1. 30 m/s towards the positive x how fast will the lighter person travel. There are no external forces. Express your answer in meters per second. Ⓡ Find the total kinetic energy "created by this two friend situation. Express your answer in joules. axisarrow_forwardA segment of DNA is put in place and stretched. Figure P7.82 shows a graph of the force exerted on the DNA as a function of the displacement of the stage. Based on this graph, which statement is the best interpretation of the DNA’s behavior over this range of displacements? The DNA (a) does not follow Hooke’s law, because its force constant increases as the force on it increases; (b) follows Hooke’s law and has a force constant of about 0.1 pN/nm; (c) follows Hooke’s law and has a force constant of about 10 pN/nm; (d) does not follow Hooke’s law, because its force constant decreases as the force on it increases.arrow_forwardA 2.5 kg object is moving to the right with a speed of 1.0 m/s when it experiences the force shown in (Figure 1). Figure Fx (N) 12- Io 0.50 s 0 -12- t (s) 1 of 1 Part A What are the object's speed and direction after the force ends? Express your answer with the appropriate units. Enter positive value if the speed is directed to the right and negative value if the speed is directed to the left. VI = Submit μA Value Provide Feedback Request Answer Units ? Activate Windo Go to Settings to actarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios