Electric Field of Point-Charges: Two tiny particles having charges +20.0 ?C and -8.00 ?C are separated by a distance of 20.0 cm. What are the magnitude and direction of electric field midway between these two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 25.2 × 106 N/C directed towards the negative charge
B. 25.2 × 106 N/C directed towards the positive charge
C. 25.2 × 105 N/C directed towards the negative charge
D. 25.2 × 105 N/C directed towards the positive charge
E. 25.2 × 104 N/C directed towards the negative charge
Answer: A
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Mass on a Spring: A mass on a spring undergoes SHM. When the mass passes through the equilibrium position, which of the following statements about it are true? (There could be more than one correct choice.)
A. Its acceleration is zero. B. Its speed is zero. C. Its elastic potential energy is zero. D. Its kinetic energy is a maximum. E. Its total mechanical energy is zero.
A force of 15.0 N is applied to a wire with an un-stretched length of 4.00 m and a diameter of 5.00 mm. If the wire changed length by 1.20 mm, then the strain in the wire is
a. 
b. 
c. 
d. 
e. 
An apple weighs approximately one ______________
Fill in the blank(s) with correct word
The figure shows the distance versus time graph of an object
The velocity of the moving object is
a.
zero.
b.
constant.
c.
increasing.
d.
decreasing.
e.
not determinable.