Mechanics | Relativity Answers

a girl coasts down a hill on a sled, reaching the bottom with a velocity of 18m/s. the coeffecient of friction between the sled's runners and the snow is 0.045, and the girl and the sled weight 500lbs. How far does the sled travel on the surface before coming to rest?

y(x,t)=8sin(300t-0.15) where x in m ,y in cm and t in second what is the wavelength,frequency,wavespeed

A bus is moving downhill at a slope of 5° on a rainy day. At the moment when the speed of the bus is
30 km h−1,the driver spots a deer 30 m ahead. He applies the brakes and comes to a stop. The deer is
paralyzed by fear and does not move. Will the bus stop before reaching it or will it hit the deer? Do
relevant calculations and draw appropriate force diagram. Take the coefficient of kinetic friction to
be μk = 0.26

A plane is flying with a constant speed along a straight line at an angle of 30° with the horizontal.
The weight of the plane is 80, 000 N and its engine provides a thrust of 100, 000 N in the
direction of flight. Two additional forces are exerted on the plane: the lift force perpendicular to
the plane’s wings, and the force due to air resistance opposite to the direction of motion. Draw
the free-body diagram showing all forces on the plane. Determine the lift force and the force due
to air resistance

If two people slide down a 50 m roof, the coefficient of kinetic friction between the first person is 0.17 and the second's friction is 0.25. Who will arrive at the bottom of the 50 m roof first?

If I am pulling a bag with a force of 25 N and the bag is on an angle of 32 degrees from the ground and the bag has a 2 kg weight, what is the coefficient of kinetic friction between the bag and the ground?

a running man has the half the kinetic energy of a body of half his mass. the man speeds up by 1m/s and has the same kinetic energy as the boy. what were the original speed of the man and the boy?

1. a student proposes to measure the gravitational constant G by suspending two spherical objects from the ceiling of a tall cathedral and measuring the deflection of the cables from the vertical. draw a free-body diagram of one of the objects. if two 100.0kg objects are suspended at the lower ends of cables 45.00m long and the cables are attached to the ceiling 1.00m apart, what is the separation of objects?

Lora (of mass 57
.
9 kg) is an expert skier. She
starts at 3
.
3 m
/
s at the top of the lynx run,
which is 126 m above the bottom.
What is her final kinetic energy at the bot-
tom of the ski run?
Answer in units of J

2.) What is her speed at the bottom?
Answer in units of m/s

Tarzan swings on a 29.0-m-long vine initially inclined at an angle of 34.0° with the vertical.
(a) What is his speed at the bottom of the swing if he starts from rest?
(b) What is his speed at the bottom of the swing if he pushes off with a speed of 4.00 m/s?