Recent content by Amelina Yoo

Homework Statement Magna is traveling at 110 kph, and realizes Commodore in front of him is traveling at 80kph. To avoid a collision, what is the max speed the Magna can have as it reaches the commodore? Homework EquationsThe Attempt at a Solution I am not sure how to approach this.

How is conservation of momentum present in an airbag?

Homework Statement Fireman weighs 100kg. He slides down a vertical pole with acceleration 3.0ms^-2. a) Magnitude and direction of vertical force exerted by the pole on fireman? Homework Equations f=ma The Attempt at a Solution [/B] f=ma f=100(3.0) f=300N vertically up. But the answer says...

The mass, force, and time was given in the question, and the remainder I calculated. The ones I calculated are correct, when referring to the answers.

The ball was at rest, and then it was hit by a bat. Sorry! I will include it in the above now.

Homework Statement How to find deceleration of a ball that is hit, given the ball: mass=0.1kg F=20N is hit by a bat for 0.01s has an acceleration of 200ms^-2 when hit by bat speed=2m per sec travels 0.01m as it is being hit by the bat Was initially at rest.Homework Equations a=(v-u)/t The...

Homework Statement What is the force needed to accelerate a 2.0kg ball at 3.0ms^-2 a) In a frictionless horizontal surface, near the surface of the Earth b) Vertically upward, near surface of the Earth Homework Equations f=ma w=mg The Attempt at a Solution For a) F=2(3) = 6N By inputing the...

Homework Statement 65kg diver dives off 10m tower. What is the divers speed on hitting the water? Homework EquationsThe Attempt at a Solution I am not sure where to start. When I solve for one variable using an equation, I find that there is a variable within that equation that is yet to be...

Homework Statement Fireman weighs 100kg. He slides down a vertical pole with acceleration 3.0ms^-2. a) Magnitude and direction of vertical force exerted by the pole on fireman? Homework Equations f=ma The Attempt at a Solution f=ma f=100(3.0) f=300N vertically up. But the answer says that...

Homework Statement 40kg girl and 8.4kg sled are 15m apart on the surface of a frozen lake. By means of a rope, girl exerts a horizontal force of 5.2N on the sled, pulling it towards her. How far from the girls initial position do they meet? Homework Equations f=ma The Attempt at a Solution I...

Homework Statement Snooker ball with mass 100g is struck by a billiard cue. Cue imparts a force of 20N to the ball and the duration of the impact is 0.01s. Homework Equations F=ma The Attempt at a Solution F=ma 20=1(a) *I converted 100g to 1kg* a= 20ms(^-2) The answers claim that the...

Homework Statement A 1200kg car moving at 20 metres per second stops in a distance of 50m when the brakes are applied. a) What is the acceleration of the car when it is braking? b) Find the force applied by the car's braking system. Homework Equations For a) I used the acceleration formula...

Q: Fred is on Earth, and Jane is on the Moon. a) Each lifts a 2.0 kg rock. Who has to apply the larger force? b) Each throws the rock horizontally with initial speed of 6.0 metres per second. Who applies the larger force? For both questions, I wrote: Fred, because the gravity on Earth is...

Q: In a tug of war between 2 athletes, each pulls on the rope with a force of 200N. a) What is the tension in the rope? b) If the rope does not move, what force is each athlete exerting on the ground? I wrote for both a) and b) 200N, and I am unable to confirm this because my textbook has no...