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:
Density equals mass over volume so 2 divided 500
<h2>Answer: at an angle
below the inclined plane.
</h2>
If we draw the <u>Free Body Diagram</u> for this situation (figure attached), taking into account only the gravity force in this case, we will see the weight 
of the block, which is directly proportional to the gravity acceleration 
:
This force is directed vertically at an angle below the inclined plane, this means it has an X-component and a Y-component:
Therefore the correct option is c
Answer:
12353 V m⁻¹ = 12.4 kV m⁻¹
Explanation:
Electric field between the plates of the parallel plate capacitor depends on the potential difference across the plates and their distance of separation.Potential difference across the plates V over the distance between the plates gives the electric field between the plates. Potential difference is the amount of work done per unit charge and is given here as 21 V. Electric field is the voltage over distance.
E = V ÷ d = 21 ÷ 0.0017 = 12353 V m⁻¹
