What is the unit of acceleration
m/s2
What is the unit of charge?
Coulomb
Which wave does the motion of vibrations move parallel to the energy transfer?
In an energy transfer 50 J of energy is put in and 20 J of wasted energy is given out, what is the efficiency of the transfer?
60 %
A cube block has a mass of 48 g and a length of 2cm. What is the density of the block?
6 g/cm3
A car starts from rest and accelerates for 5 seconds. The final speed is 40 m/s. What is the acceleration?
8 m/s2
What is meant by the term a.c?
Alternating current
What is the term for the bending of light when light moves into a different medium?
Refraction
Which type of thermal energy transfer uses the idea of lower density rises up.
Convection
A fish swims from the surface to 7m deep in water (density is 1000 kg/m3), what is the pressure difference on the fish?
70,000 N/m2 or 70kPa
A book has a mass of 0.5 kg. When attached to a spring the spring extends by 20 cm. What is the spring constant for the spring?
25 N/m
0.33 A
50 degrees to the normal
A lift uses 560 J of energy in 8 seconds, what is the power of the lift?
70 W
What is the value of absolute zero in Celcius?
-273 oC
A parachutist reaches terminal speed. Explain in terms of forces what this means.
The acceleration is zero as the weight is equal to the air resistance so the resultant force is zero.
A current of 10 A flows for 1 minute. How much charge flows?
600 C
State the components of the EM spectrum in increasing order of frequency
Radio, Micro, Infrared, Visible, Ultraviolet, X-ray, Gamma
A skateboarder of mass 60 kg moves with a speed of 4 m/s. What is the kinetic energy of the skateboarder?
480 J
A gas takes up a space of 5m3 and is at a pressure of 100 kPa. The gas is allowed to expand at constant temperature to occupy 25m3, what is the new pressure?
20kPa
1.5 m/s
A plastic ruler is rubbed with a cloth. The ruler is then attracted to some positive charges. Explain why.
The friction means that some negative charges from the cloth to the ruler so the ruler becomes negatively charged.
What is the range of human hearing?
20 - 20,000 Hz
State 2 renewable and 2 non-renewable electrical energy resources.
Wind, hydro, wave, tidal, geothermal, solar... fossil fuel, nuclear
A kettle is used to heat up some water, the temperature is measured every second using a data logger. The temperature initially increases. After 2 minutes the temperature remains constant. Why does the temperature remain constant?
The energy is being used to change the state of the water to steam.