Fill This Form To Receive Instant Help
Homework answers / question archive / American University in Cairo  PHYSICS 1011 Chapter 7—Kinetic Energy and Work MULTIPLE CHOICE 1)A constant force of 12 N in the positive x direction acts on a 4
American University in Cairo  PHYSICS 1011
Chapter 7—Kinetic Energy and Work
MULTIPLE CHOICE
1)A constant force of 12 N in the positive x direction acts on a 4.0kg object as it moves from the origin to the point m. How much work is done by the given force during this displacement? a. +60 J
How much work was done by the resultant force during this time interval, assuming no energy is lost in the process? a. 17 J
5.4 N) as shown in the figure. The magnitude of the force of friction acting on the block between A and B is 1.2 N and points A and B are 0.5 m apart. If the kinetic energies of the block at A and B are 4.0 J and 5.6 J, respectively, how much work is done on the block by the force P between A and B?

m to 

m? 









m to 
a. 34 J
b. 
64 J 
c. 
30 J 
d. 
94 J 
e. 
+64 J 
k = 2.0 kN/m


a. 
3.7 m/s 
b. 
4.4 m/s 
c. 
4.9 m/s 
d. 
5.4 m/s 
e. 
14 m/s 
5.7 m

and 
drawn starting at the same point, what is the angle between them? 








, 
the same point) is 60q, what is the scalar product of these two vectors? 








are drawn starting from the same point is 110q, what is the scalar product of these two vectors? 





vectors is 100, what is the magnitude of the sum of these two vectors? 





?
a. 2.1
2.5 c. 2.3
, 
, and 
drawn starting from the same point? 










vector is 16. The scalar product of and is +18. The z component of is 0. What is the magnitude of ?









a. 
+96 


b. 
96 


c. 
+51 


d. 
51 


e.

35 




39. 

If 

= 
10, 

= 
15, and 
D 

= 130 
q 
, 
determine the scalar product of the two vectors shown. 






40. 

If 

= 
5.0, 

= 
8.0, and 
D 

= 

30 
q 
, determine the scalar product of the two vectors shown. 




20 d. +20
e. +40


= 
6.0, 



the ground, the relation between their kinetic energies, K_{A} and K_{B}, is 






a. 

. 

b. 

. 

c. 

K 
A 

= 

K 
B 
. 

d. 

. 

e. 

. 



a. 

. 

b. 

. 

c. 

v 
A 

= 

v 
B 
. 

d. 

. 

e. 

. 



.
The most likely physical situation it describes is a. a 2.30 kg cart rolling up a 30q incline.

and 

and 

and 



b.
c.
d.


PROBLEM
Already member? Sign In