Question: part a multiple choice 10 marks circle the alternative...
Part A - Multiple Choice 10 Marks Circle the alternative A, B, C or D that best answers the question (1 Mark each)
1. Which quantities would you need to measure in order to calculate the amount of electrical energy used to heat water using an electric element?
A. Time, current and charge
B. Potential difference and current
C. Potential difference, current and resistance
D. Potential difference, current and time
2. A model train travels around a circular track which has a radius of 1.0 m. The train travels at a speed of 2.0 m s-1 . Which one of the following best describes the displacement of the train when it has completed one-half of a revolution of the track?
A. The displacement is zero
B. The displacement has a magnitude of 2 π meters
C. The displacement has a magnitude of 2.0 meters
D. The displacement has a magnitude of 4.0 meters
3. A skier is sliding down a gentle slope of soft snow. She is travelling down the slope at a constant speed. Which the following best describes why her speed is not changing?
A. The friction from the snow balances the downhill component of her weight.
B. The gravity component down the hill is not strong enough to accelerate her.
C. The friction of the snow is equal to her weight.
D. The slope is not steep enough for any acceleration to occur