Other Physics Answers

1 a State one difference and one similarity between boiling and evaporation of water. [2]

b A glass of water is placed in direct sunlight during a hot summer’s day.

The temperature of the water increases.

i Describe the change in the motion of the molecules of water. [1]

ii Explain whether or not there is a change in the internal energy of the water. [3]

c Complete the table below for each of the processes shown. Use the symbol ‘+’ for

an increase, the symbol ‘–’ for a decrease and ‘0’ for no significant change, as appropriate. [3]

Kinetic energy

of the particles

Potential energy

of the particles

Internal energy

An aluminium block increasing

its temperature from room

temperature to 300 °C.

Water boiling at 100 °C and

changing into steam at 100 °C.

Water at 0 °C changing into ice

at –15 °C.

A truck uniformly accelerates from rest to reach the end of the road with a speed of 40m/s. What's is the trucks acceleration?

1. What happened when the straw was used to blow air into the honey?
2. How does honey behave differently from the water?
3. How does the difference relate to volcanic eruptions?  (Must relate to Volcano Characteristics Video Lesson Content, do not internet search)

Within the Earth, magma can reach 1,400∘

C. How hot would that be in Fahrenheit? You can look it up or practice using the formula to convert.

∘

F = 9/5 ∘

C + 32

Two spherical objects have equal masses and experience a gravitational force of 25 N towards one another. Their centers are 36 cm apart. Determine each of their masses.

What is the angular acceleration of a ball that starts at rest and increases its angular velocity uniformly to rad/s in 10 s?

What is the angular velocity of an object traveling in a circle of radius 0.75 m with a linear speed of 3.5 m/s?

Mark bought a pizza of a radius of 0.5 m. A fly lands on the pizza and walks around the edge for a distance of 80 cm. Calculate the angular displacement of the fly?

Water at room temperature flows with a constant speed of 8.00 m/s through a nozzle with a square cross section, as shown in the figure. Water enters the nozzle at the point A and exits the nozzle at point B. The length of the sides of the square cross section at A and B are 50.0 cm and 20.0 cm, respectively.

a. What is the volume flow rate at the exit?

b. What is the acceleration at the exit? The length of the nozzle is 2.00 m.

c. If the volume flow rate through the nozzle is increased to 6.00 m3/s, what is the acceleration of the fluid at the exit?

A block of cherry wood that is 20.0 cm long, 10.0 cm wide, and 2.00 cm thick has a density of 800. kg/m3. What is the volume of a piece of iron that, if glued to the bottom of the block, makes the block float in water with its top just at the surface of the water? The density of iron is 7860 kg/m3, and the density of water is 1000. kg/m3.

13. An automobile accelerates uniformly at 8 m/s2. If the force causing the acceleration is 6000 N, what is the mass of the automobile?

14. Find the force required to increase the velocity of a 1.2 kg mass from 3 m/s to 8 m/s over a period of 4 seconds.