Other Physics Answers

1. An object is 70 µm long and 47.66 µm wide. How long and wide is the object in km? (4)

A) 70 000 km long and 47622 km wide.         

B) 7.0 x 10-8 km long and 4.8 km wide 

C) 7.0 x 10-8 km long and 4.766 x 10-8 km wide

D) 0.7 x 10-8 km long and 4.766 x 10-7 km wide 

2. Which one of the following is the longest length? (4)

A) 100 decimeters C) 105 millimeters E) 10-7 nanometers

B) 10-2 centimeters D) 101 meters

1. An object is 70 µm long and 47.66 µm wide. How long and wide is the object in km? (4)

A) 70 000 km long and 47622 km wide.         

B) 7.0 x 10-8 km long and 4.8 km wide 

C) 7.0 x 10-8 km long and 4.766 x 10-8 km wide

D) 0.7 x 10-8 km long and 4.766 x 10-7 km wide 

2. Which one of the following is the longest length? (4)

A) 100 decimeters C) 105 millimeters E) 10-7 nanometers

B) 10-2 centimeters D) 101 meters

3. A typical E.coli bacteria is about 5 microns (or micrometers) in length. How long is this length in millimeter? (3)

A) 5.000 mm C) 0.005 mm E) 50 mm

B) 5000 mm D) 0.05 mm

4. Which one of the following equations are dimensionally consistent? (3)

A) v = at2 C) v =  

B) v = at2 D) v2 = 2ax

5. How many significant figures does the number 0.000054 have? (2)

A) 4 C) 5

B) 6 D) 2

6. How many significant figures does the number 3.001 x 105 have? (2)

A) 4 C) 7

B) 10 D) 2

a certain spring has a force costant of K=25N/cm.

(a) of an object with mass of 500g were hung from spring, how far in cm would it strech?

(b) what is the mass of an object that streches the spring 35cm?

In a wire, when elongation is 4 cm energy stored is E. if it is stretched by 4 cm then the eilw derots energy stored will be

As water enters the turbine at the bottom of the dam the kinetic energy of 8.0 kg of moving water is 1100j calculate the speed of the moving water as it enters the turbine

Explain why does renewable sources provide an increasing fraction of the electricity supply for many countries

1. For each combination of media,which light ray (A or B ) will undergo total internal reflection if the incident angle is gradually increased?

1.Look around you and list 5 things that use electricity.Identify each thing whether it is utilizing AC or DC

2.Identify and illustrate the chain of electromagnetic energy transformations involved in making the blades of a ceiling fan spin.Include the Fan's motor,the transformers Bringing electricity to the house,and the turbines generating electricity

3. Explore the relationship of Lenz law to Newton's 3rd law of motion,energy conservation,and the 2nd law of thermodynamics (impossibility of a perpetual motion machine)

1. A polarized light of intensity 10 is passed through another polarizer whose pass axis makes an angke of 60 degrees with the pass axis of the former. What is the intensity of emergent polarized light from second polarizer?

2. What angle is needed between the direction of polarized light and the axis of a polarizing filter to reduce its intensity by 90.0%?

1. A circular antenna of area 3 m² is installed at a place in NAIA. The plane of the area of antenna is inclined at 47 ō with the direction of Earth's magnetic field. If the magnitude of Earth's field at that place is 40773.9 nT, find the magnetic flux linked with the antenna. (1 nT=1x10^-9 T)

2. Suppose you are wearing a bracelet that is made of unbroken ring of copper wire. I f you walk briskly into a strong magnetic field while wearing the bracelet, how would you hold your wrist with respect to the magnetic field in order to avoid inducing a current in the bracelet?

3. Compare and contrast electrostatic field and non-electrostatic/induced electric field by using venn diagram.