Homework Solution 6
Physics 121, Section 1
Due 9/25/07
1. Work out the physics of the Monkey Hunter demonstration we did in class on Tuesday, September 20.
Assume that a projectile is shot from a blow gun at the same time a monkey drops from rest by letti
Homework Solutions 1
Physics 121, Section 1
Due 9/6/07
In the rst two problems of this solution, I have included the full level of
detail I would expect to see in your solutions. In the nal problem and on
subsequent assignment, we will usually only includ
Homework Solution 2
Physics 121, Section 1
Due 9/11/07
1. Wilma I. Ball walks at a constant speed of 4.83 m/s from home to the pharmacy to pick up her
prescription. She then walks back home along the same route with a constant speed of 3.66 m/s;.
What is
Homework Solution 7
Physics 121, Section 1
Due 10/2/07
1. (a) Why do you fall backward when standing inside a bus which is accelerating from rest?
As the bus accelerates forward, your body tends to follow Newton's First Law and not
accelerate. Thus, in an
Homework Solution 10
Physics 121, Section 1
Due 10/11/07
1. The loaded car of a roller coaster has mass m = 320 kg. It goes over the top of a `hill' with a speed v
of 20 m/s. The radius of curvature R of the hill is 15 m.
(a) What are the magnitude and di
Homework Solution 9
Physics 121, Section 1
Due 10/9/07
1. A block with a mass of M = 7.65 kg is initially moving up the incline and is increasing speed with
a = 1.44 m/s2 . The applied force F is horizontal. The coecients of friction between the block and
Homework Solution 8
Physics 121, Section 1
Due 10/4/07
1. A block starts from rest at the top of a d = 2.00-m long, = 38.0 frictionless incline.
(a) What is the acceleration of the block?
Solution: Let the x direction be down the incline. The y direction
Homework Solution 5
Physics 121, Section 1
Due 9/20/07
1. What is wrong with the physics in the following statement? The car rounds the turn at a constant
velocity of 50 km/h Rewrite it so that it conveys the correct meaning.
Solution: If the car is round
Homework Solution 4
Physics 121, Section 1
Due 9/18/07
1. Joan measures the distance across a straight river by the following method:
Starting directly across the river from a tree on the opposite bank, she
walks 106 m along the river bank to establish a
Homework Solution 3
Physics 121, Section 1
Due 9/13/07
1. Eric slams on the brakes when he sees a tree blocking the road. The
car slows uniformly with an acceleration of -5.12 m/s2 for 3.51 s, making
straight skid marks 61.4 m long ending at the tree. Wit