1. A wave completes 20 cycles in 8 seconds. The frequency of thewave is .

a) 2.5 Hz

b) 160 Hz

c) 0.4 Hz

2. The electric face between two charged particles is F . As thedouble the distance between the two charges , the new force will be.

a) F/2

b) F/4

c) 2F

d) 4f

3. Two objects are on the right end of a seesaw . object A (m=10kg ) is 20 cm away from the fulcrum and object B ( m =15 kg is 10cm away from the fulcrum . Where would object C (m - 20 kg ) needto be placed to balance the seesaw.

a) 17.5 cm to the right

b) 17.5 cm to the left

c) 30 cm to the right

d) 20 cm to the left

4. Mike's car is initially moving at 25 m/s . He slams on hisbrakes as he approached a red light. If it took his car 4 second tocome a full stop , find the car's acceleration.

a) 6.25 m/s²

b) -6.25 m/s²

c) 100 m/s ²

d) -100m/s²

5. A ball  is cropped from rest . Find the speed ofthe ball after 4.2 seconds has passed

a) 4.2 m/s

b) 9.8 m/s

c) 41.2 m/s

d) 19.5 m/s

6. A 4-cm tall object is placed 24 cm in from of a converninglens with a formal length of 18 c, . The height of the image is

a) -4 cm

b) 4 cm

c) 12 cm

d) -12cm.

b) 4 cm

c) 12 cm

d) -12 cm.

7. A 100 - Watt light bulb is connected to a 120 -volt powersupply . Find the current flow through the light bulb.

a) 1.2 A

b) 0.83 A

c) 100 A

d) 12.000A