Your forehead can withstand a force of about 6.0 kN before fracturing, while your cheekbone can withstand about 1.3 kN. If a 140 g baseball strikes your forehead at 25 m/s and stops in 1.7 ms, are you in danger of experiencing a fracture? What about if the ball hits your cheek instead?

Q: 4. In an elastic head-on collision, a 0.60 kg cart moving at 5.0 m/s [W] collides with a 0.80 kg…

A: m1 = 0.60 kg m2 = 0.80 kg u1 = -5 m/s u2 = 2 m/s k = 1200 N/m

Q: rider of mass 73.0-kg sits 1.40 meters left of the pivot point.  A different rider sits 3.4 meters…

A:

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Q: Assuming that the system is in equilibrium, find the value of m3, knowing that:   r1=1.6 m r2=0.8…

A: Given,

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A: Power dissipation is same for both the journey and power is work done per unit time.  Use this as…

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A:

Q: Consider two air hockey pucks resting on the table with the air on as shown in the figure. The two…

A: According to Work-kinetic energy theorem, Since both the puck start from rest, so its initial…

Q: m1 h m2 4.00 m/s m2

A: m1 = 0.5 kg m2 = 3 kg g = 9.8 m/s2initial speed of the system = 0 m/s

Q: Tarzan, who has a mass of 80 kg, holds onto the end of a vine that is at a 12° angle from the…

A:

Q: A 500 gram meter stick has a center of mass at the 50 cm mark. Using two fingers, one at the 10 cm…

A: In this question we are given that a 500 gram meter stick has a center of mass at the 50 cm mark.…

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A:

Q: Emma and Katie are racing along in their new wagon. Upon reaching the bottom of the hill traveling…

A: Given Katie speed at the bottom of the hill = u = 13.2 m/s Distance between Katie and her teddy bear…

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A:

Q: A 300 gram meter stick has a center of mass at the 50 cm mark. You place a pivot at the 50 cm mark,…

A:

Q: A 160 g baseball is thrown with a speed of 20 m/s. It is hit straight back toward the pitcher at a…

A:

Q: Water falls without splashing at a rate of 0.320 L/s from a height of 2.10 m into a 0.770-kg bucket…

A: Given data: rate of water falls in the downward direction is, R=0.320 L/s The height from which…

Q: This is one way to measure a person's center of mass.  She lies on a plank on two scales: one at her…

A:

Q: In real life examples, what do you think are the factors that would change the elasticity between…

A: In real life examples, what do you think are the factors that would change the elasticity between…

Q: A 12 kg box collided with a 15 kg ball while traveling at 3.5 m/s. The box came to rest, and the…

A: kinetic energy of a body of mass m is given by  KE = 0.5 mv2  here  m is mass of body  and v is…

Q: A 2.5 g marshmallow is placed in one end of a 40 cm pipe, as shown in the figure above. A person…

A: Given data:   Mass (m) = 2.5 g = 0.0025 kg Distance traveled (d) = 40 cm = 0.40 m Initial velocity…

Q: 15. A moving curling stone, A, collides head on with a stationary stone, B. Both stones are of…

A:

Q: A 75.0 kg person is riding in a car moving at 10.1 m/s when the car runs into a bridge abutment as…

A: Given: The mass of the person is 75.0 kg. The initial speed of the car is 10.1 m/s. The time…

Q: A mobile is constructed of light rods, light strings, and beach souvenirs as shown in the figure…

A:

Q: A truck with a mass of 1600 kg and moving with a speed of 13.5 m/s rear-ends a 585 kg car stopped at…

A: Mass of truck (M) = 1600 kg Mass of car (m) = 585 kg Initial velocity of truck (U) = 13.5 m/s…

Q: a 15 kg block is held in place via a pulley system. The person’s upper arm is vertical; the forearm…

A: Mass of the block,   Mass of forearm and hand together,

Q: (a) Tony Hawco (m362 kg), a Newfoundland based skater decides to have his first ride on the new…

A: Given Data : The velocity of tony at point A is given as v0=2 ms The velocity of tony at point B is…

Q: What average force is necessary to stop a 45 caliber bullet of mass 15 grams and a speed of 300 m/s…

A: Given data: Mass of the bullet m = 15g=0.015kg Speed v= 300 m/s Distance s = 5 cm = 0.05 m

Q: As shown in the figure, when the points P and Q move downward with a velocity of v =4 (m/s), what is…

A:

Q: 9.7 kg block of wood resting on a platform was hit by a 31 g of bullet travelling upward with a…

A:

Q: In an inelastic collision, as compared to an elastic collision, what is to be expected

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Q: A 22-g bullet traveling 285 m/s penetrates a 2.0 kg block of wood and emerges going 140 m/s. Part A…

A: Given data: Mass of bullet (m) = 22 g = 0.022 kg Initial velocity of bullet (v) = 285 m/s Mass of…

Q: The system, which is initially stationary, started to move with m, and m3 weights as shown in the…

A: According to the Newton's second law  Net force = mass x acceleration

Q: To get up on the roof, a person (mass 70.0 kg) places a 6.00-m aluminum ladder (mass 10.0 kg)…

A: It is given that, m1=70 kgm=10 kgl1=4 ml2=3 ml=6 mg=9.8 m/s2

Q: A 300 gram meter stick has a center of mass at the 50 cm mark. Using two fingers, one at the 5 cm…

A: The meter stick can't be balanced on these two fingers. Proper reasoning is given in next step.

Q: You and your friends are doing physics experiments on a frozen pond that serves as a frictionless,…

A: Given data: Mass of Nowell, m1=80 kg Speed v1=6.00 m/s at θ1=370 Mass of Allyzza, m2=50 kg Speed…

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A:

Q: A 2.00×104 kgkg railroad car is rolling at 1.00 m/sm/s when a 6000 kgkg load of gravel is suddenly…

A: Given data The mass of the railroad car is given as mr = 2 x 104 kg. The initial speed of the…

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A:

Q: A 0.400-kg blue bead slides on a frictionless, curved wire, starting from rest at point Ⓐ in Figure…

A: The expression for the initial speed of the blue bead,

Q: -How many N is the force in the III direction in the system in the figure?  A) 160  B) 120  C)…

A: α = θ1=37o

Q: Slides and Sticks! m = 0.250 kg M = 0.500 kg A small block with mass m = 0.250 [kg] slides down a…

A:

Q: You and your friend Peter are putting new shingles on a roof pitched at 24°. You're sitting on the…

A: The parallel force exerted on the roof is, F=mgsinθ=29.8sin24°=7.97 N The frictional force is,…

Q: A meter stick has a center of mass at the 50 cm mark. Using two fingers, one at the 20 cm mark and…

A:

Q: In an elastic collision in which there are no external forces, which of the following is true?…

A: Momentum is sort of thing Newton explained as, the things in motion stay in motion, unless affected…

Q: A block of mass ?=3.70 kgm=3.70 kg slides along a horizontal table with velocity ?0=4.00 m/sv0=4.00…

A: