physics Flashcards
Calculate the kinetic energy of a 0.2 kg cricket ball travelling at 10 m/s
Use the following formula:
Eₖ = ½ mv²
10 J
A football is kicked by a goalkeeper and rises high in its flight before returning to the ground.
The ball has a mass of 0.4 kg and the maximum height it reaches is 25 m. Calculate the gravitational potential energy of the ball at the highest point. g = 10 N/kg.
Use the formula:
Gravitational potential energy = mass × gravitational field strength × height
100 J
This is a series circuit.
Select which one of the following statements is true about this type of circuit.
There is the same current through each component
A light bulb transfers 600 J of energy every minute.
Calculate the power rating of the bulb in watts.
10 w
A potential difference is applied across a resistor, to cause a current to flow through it. If the potential difference is doubled, which one of the following statements is true?
The current flowing through the resistor is doubled
The density of a material can be calculated from its mass and its volume.
Use the formula above to calculate the density of a block of concrete with a volume of 20 cm³ and a mass of 48 g.
2.4 g/cm³
A beaker of water is heated so that its temperature increases from 15 °C to 50 °C. If the mass of water is 200 g and the specific heat capacity of water is 4200 J/kg °C, how much thermal energy has been supplied to the water?
Use the equation:
Change in thermal energy = mass × specific heat capacity × temperature change
29,400 J
Which of these nuclear emissions is an electron travelling at high speed?
Beta particle
A train accelerates from a speed of 10 m/s up to 30 m/s. It takes 40 s to reach this speed.
Use the formula above to calculate its acceleration. paper 2
0.5 m/s²
