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PHY 2048
Midterm Exam 
DAY
Fall 2009
Use g = 9.80 m/s and G = 6.67 × 10
11
Nm
2
/kg
2
.
2
1. [15 points]
A mass M (837 kg) is at the origin and a
mass m (372 kg) is located at the point
x = 0.055 m, y = 0.037 m as shown.
(A) Find the magnitude
of the gravitational force between mass M and mass m.
(B) Specify the vector
gravitational force of M
on
m
using components.
2. [10 points]
A motor in a 5.73 kg cart produces an acceleration of 0.387 m/s
2
when the cart
is traveling at 2.87 m/s.
Calculate the power being produced by the motor.
3. [20 points]
Mass B (11.8 kg) is on a frictionless incline
as shown, connected by a massless rope to
mass A which is hanging from an ideal pulley.
The incline is at
2
= 41.6° above horizontal.
Find the mass of A so A accelerates upward
at 2.06 m/s
2
.
(
Sketch your freebody diagrams below.
)
4.
[5 points]
If you double the mass of an object and cut its speed in half, by what factor
does the kinetic energy change?
(Circle the correct answer.)
A)
8
B)
4
C)
2
D)
1
E) 1/2
F)
1/4
G)
1/8
5. [20 points]
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View Full Document A 5.37 kg cart is moving at 3.75 m/s at point A.
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This note was uploaded on 12/30/2011 for the course PHY 2048 taught by Professor Laposky,e during the Fall '08 term at Tallahassee Community College.
 Fall '08
 Laposky,E
 Physics, Mass

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