Question

A ball is projected horizontally with a velocity of 5ms -1 from the top of a tower of height 10m. When it reaches the ground (g =10ms -2)(a)vertical component of its velocity is 15ms -1(b)Horizontal component of its velocity is 14ms -1(c)Its velocity is 15ms -1(d)Its velocity is 29−−√ ms -1

Answer 1

Explanation:

Consider the following information about an electric car. Let us assume that the car consumes the equivalent energy of 0.5-1 litre of gasoline to drive 15 km.

1 Wh = 3.6 kJ → Energy to lift 100 kg 3.7 meters

1 cal = 4.2 J → Energy to raise the temperature of 1 g water with 1 degree

1 MJ = 0.28 kWh → Energy to accelerate a car of 1000 kg to 161 km/h (no air resistance)

36 MJ = 10 kWh → Energy content of 1 liter gasoline

What is the estimated energy required to drive this light electric car for 150 km?

1) 50-100 kWh

2) 100-200 kWh

3) 200-500 kWh

4) >500 kWh

Answer 2

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Explanation: