Other Physics Answers

A stone is thrown into the air at a 15 m/s at an angle of 30 degree.

a. What is the height reached of the stone?

b. What is the time taken by the stone in the whole travel?

C. What is the ranged reached by the stone?

d. A ball is projected with initial velocity of 18 m/s at an angle of 25 degree. What is the time of flight of the ball?

e.What is the horizontal displacement of the object thrown into the air at a velocity of 30 m/s with an angle of 28 degree?

A 1.0 kg block of steel is heated in an oven to a temperature of 200 °C. It is then dropped into a tank containing 100 kg of water.                                                                                                                     

The experiment is then repeated using a 1.0 kg block of aluminum.

Which metal block will cause a bigger rise in the temperature of the water? Explain your answer.

You have measure the length of a rope as 15.46 m, using a meter ruler. Find the present error associated with the measurement.

1. 200-gram ball, m1 and a 100-gram ball, m2, connected by a rod with length of 60 cm. The axis of rotation is located at ball m2. What is the moment of inertia of the balls. Ignore rod’s mass
2. A slim rod 2.0 m long has two small 0.50-kg bodies attached at its two ends and a 0.25-kg body at its midpoint as shown. Find the moment of inertia about an axis perpendicular to the rod has negligible mass.
3. Four identical masses of 2.0 kg each situated at the four corners of a square. A side of the square measures 3.0 m. Find the moment of inertia about an axis passing through the center of the square and perpendicular to its plane. 

1. A wheel with a diameter of 80cm speeds up from 30 rad/s to 80 rad/s. The linear acceleration at the edge of the wheel is 15 m/s2. How many revolutions will the wheel go through during this period?

A disk with diameter of 60 cm speeds up from 20 rad/s to 40 rad/s in 5 seconds. (a) How many revolutions will the disk go through during that time period? (b) What is the average angular acceleration of the disk? (c) What is the average linear acceleration of the disk?

A small stone is thrown away into the air with a velocity of 15 m/s at an angle of 30 degree along the horizontal. (With solution)

a. Find the maximum height reached by the object,

b. Time of flight, and

C. Range

Nikki drops her doll from the rooftop 10 m above the ground. Neglecting air resistance, how long it will take to reach the ground?

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?