Physics Answers

Q5. A 5 kg of ice cube at -10°C is mixed with 0.1 kg of water at 80 °C. There is no heat

loss to the surrounding. The specific heat capacity of ice is 2.22 kJK-1kg ? The specific

heat capacity of water is 4.187 kJK-kg“The specific latent heat of fusion of ice is

333 kJ kg-1

(a) What is the final physical state of the mixture? (Gas, Liquid or Solid?)

Justify your answer using suitable calculations

(b) What is the final temperature of the mixture?

Q 2. A mercury-glass thermometer consists of a glass bulb filled with mercury and a

narrow glass tube attached to the glass bulb. At 0°C, the bulb is completely filled with the

mercury and its radius is 5 mm. As the temperature increases the mercury column rise

through the narrow glass tube whose diameter is 0.3 mm.

What should be the minimum length of the glass tube so that this thermometer can be

used to measure the temperatures up to 100 °C ?

(Hint: ignore the thermal expansion of the glass tube)

liner expansion coefficient of glass = 3.2 x 10-6 °C-1

volume expansion coefficient of mercury = 1.82 x 10°C

A 9v stabilized voltage supply is required to run a car stereo system from car 12 v battery.A zener diode with Vz = 9v and Pmax. = 0.25 W is ued as a voltage regulator as shown in figure .find the value of the series resistor.

A stone is thrown vertically up with an initial velocity of 4.9 m/s from the top of a building that is 52 m high. On its way down , it misses the top of the building and goes straight to the ground. Find a.) maximum height reached b.) maximum height reached relative to the ground and its velocity when it strikes the ground if the time of flight is 3.8 s. 

what is the direction of the electric field at the test point on the "-x-" axis , 50cm from the charge q=-5.00 nC which is located at the origin a. eastward b.westward c.northward d.southward

SA13. A basketball player throws a desperation shot at the buzzer from the backcourt 1.0 second before the game ended with the score tied. If the ball was released at a velocity of 12.0 m/s at an angle of 38O and if the release was made at the same level as the basket from a distance of 14.2 m, did he score? Why?

SA12. Illustrate the path of a projectile launched at a velocity of 150.0 m/s at an angle of 50O with the horizontal and find, illustrate, and label the following in the same illustration you have. a. The viy of the projectile

 b. The vix of the projectile

 c. Its vy 2.0 seconds after it was launched

 d. Its vf based on letter c 

e. Its maximum height (𝐦𝐚𝐱 𝐝𝐲 ↑)

 f. The time it will reach a height of 3.0 m (𝒕 ↑) 

g. Its position/location 4.0 seconds of its flight (𝐝𝐲 ↑) 

h. Its range ( R ) 

Compare the apparent frequencies of a 2450 Hz source moving away from you at 25m/s and when you are moving away from the source at 25mLs

A simple pendulum of length 60.0 cm takes to make 12 complete back and forth motion.

(A) find it's period. (B) what will be it's period when it's Length is increased to 240.0 cm

A 1.50kg object hangs motionless from a spring with a force constant of k=250N/m.how far is the spring stretched from it equilibrium length