Define rest and motion. Explain that whether they arE relative or absolute. Q2.

Question

Define rest and motion. Explain that whether they arE relative or absolute. Q2. Define projectile. Explain its vertical and horizontal velocity change during its flight. Q3. A coin dropped from a building at 170 m above the street. Determine the time required for coin to free fall from the top of building to the street below. Q4. How much horsepower is in a 2100 W vacuum cleaner? How much energy docs a 20 W energy saver bulb consume per second? Q5. A kids flying airplane moving with 0.5 m/s and a mass of 0.5 kg going to crash. How much work is required to stop the plane?

Explanation / Answer

01)rest and motion are only relative

02)a particle thrown into air by making certain angle with the horizontal is known a projectile.

its horizontal component of the velocity remains constant .and vertical component changes.

03)170=1/2X9.8Xt2

calculating t=time=5.88sec

04)2.8161

because 1 horse power=745.699w

1w=1joule/sec

so 20J

5)work=1/2X0.5X0.52=0.0625J

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