Physics Answers

Lesson : Periodic Motion

1. A device that is used for medical diagnosis oscillates at a frequency of 6.7 X 10⁶ Hz. How much time does each oscillation take? What is also its angular frequency?

2. Determine the displacement of an object that is undergoing SHM whose angular

frequency is 20°/ sec and its amplitude is 300mm at t = 1.5 sec.

3. Write down at least three (3) real life situations where periodic motion is applicable.

How much heat is needed to heat up 70 g of water from 20oC to 80oC in kcal?

When 1.0 m3 of an ideal gas expands to 2.5 m3 at a constant pressure of 1000 N/m2, how much of work is done by the gas in J?

How much heat is needed to melt 60 g of ice at 0oC in kcal?

If you add 600 cal of heat to 50 g of water at 10oC, what will be the temperature of the water in oC?

Work of 500 J is done by an ideal gas, when 500 cal of heat is added to the gas. What is the increase in the internal energy of the gas in J?

Determine the force of gravitational attraction between the earth (m=5.98×10²⁴kg)and a 70-kg STEM student if the students is standing at sea level,a distance of 6.38× 10^6 m from earth's center.

Which statement/s is/are true about forces?

Statement A: Force is any push or pull.

Statement B: Two interacting objects must always be in direct contact in order for them to exert force on each other.

Both statements are true.

Neither statement is true.

Which of the following cannot be stepped -up in a transformer?

A. Input current

B. Input power

C. Input voltage

D. All

What is necessary to determine easily the direction of the induced current?

A. Level of gravitational intensity

B. Magnetic polarity of coil side

C. Atomic properties of the material

D. All of these