fete fardealla PHY 211 Professor Dolise Newton\'s Laws Homework 01 1) Starting f
ID: 1440446 • Letter: F
Question
fete fardealla PHY 211 Professor Dolise Newton's Laws Homework 01 1) Starting from rest, a car of mass 914.0 kg travels 273.0 m in 13.20 s. a) Find the car's acceleration. Find the force acting on the car. b) 2) What force is necessary to throw a 0.75 kg rock striaght up with a net upward acceleration of 1.2 m/s 3) A race car traveling at 23.1 m/s accelerates for 5.00 s at a rate of 3.44 m/s. a)What distance has it traveled in those 5.00 s? cause the acceleration? b) If its mass is 1100 kg, what force was necessary to 4) A kid on a bike is traveling at 8.0 m/s. The mass of the kid and bike is 45 kg. What force is necessary to bring the bike to a stop in 20.0 m? 5) Two kids pull a sled of mass 12.3 kg with ropes. One kid exerts a force of 35.0 N, the other kid pulls with 27.0 N. The angle between the ropes is 40.00. What is the acceleration of the sled? Both ropes are horizontal and as shown in the diagram. 27.0NExplanation / Answer
1.
a) usintg d = ut + at^2 /2
273 = 0 + a(13.2^2)/2
a = 3.13 m/s^2
b) F = ma =914 x 3.13 = 2864.12 N
2. Using Fnet = ma
on rock in vertical,
F - mg = ma
F = 0.75 ( 9.8 + 1.2) = 8.25 N
3. a) d = ut + at^2 /2
d = (23.1 x 5) + (3.44 x 5^2 /2 ) =158.5 m
b) F = ma = 1100 x 3.44 =3784 N
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