Average Speed = 23.33 m/s
<u>Explanation:</u>
Given:
Diameter = 7 km
So, to find the distance, we need to multiply it by 10 as the race car circles 10 times round this 7 km track.
Distance = 7 × 10 = 70 Km or 70,000 m
Time = 50 mins
= 50 × 60 = 3000 s
Now, in order to find the average speed for 10 cycles, we use the formula:
So by substituting the above values in the given formula, we get:
Speed = 23.33 m/s
Answer:
Explanation:
Young's modulus of elasticity Y = stress / strain
stress = force / cross sectional area
= weight of 15 kg / π r²
= 15 x 9.8 / 3.14 x ( .025 x 10⁻² )²
stress = 74.9 x 10⁷ N / m²
strain = Δ L / L , Δ L is change in length and L is original length
Putting the values
strain = .0168 / 2.7 =.006222
Young's modulus of elasticity Y = 74.9 x 10⁷ / .006222
= 120.88 x 10⁹ N / m² .
The airplane engine uses oxygen from the air to keep the engines working. Rockets must carry their oxygen for the engines to operate. Third Law of Motion). Rocket propellants by combustion provide the hot gas es that produce reaction force (thrust) when ejected to the rear.
Answer:
Explanation:
The electric force between charges is much larger than the gravitational force but Gravitational force between earth and moon is dominant over Electric force because earth and moon are the electrically neutral body.
Electrically neutral bodies are those bodies that contain equal no of electron and proton in the body.
An example of electrically neutral bodies is a neutron.
