Answer:
Explanation:
Let's look at a mathematical representation of this. The equation for tis is just a souped up version of Newton's 2nd Law:
F - f = ma. It an object is moving at a constant speed, the acceleration of that object is 0. That changes this equation to
F = f which states that the applied Force equals the frictional force, choice a.
Answer:
B. Northern Canada
Explanation:
A continental polar air mass can form over the land during the winter months. In the Northern Hemisphere, it originates in northern Canada or Alaska. As it moves southward, it brings dry weather conditions to the United States. Temperature and humidity levels are both low. Hope this helps :)
Answer:
6.003×10¯⁶ N
Explanation:
We'll begin by converting 1 cm to m. This can be obtained as follow:
100 cm = 1 m
Therefore,
1 cm = 1 cm × 1 m / 100 cm
1 cm = 0.01 m
Finally, we shall determine the gravitational attraction. This can be obtained as follow:
Mass 1 (M₁) = 3 Kg
Mass 2 (M₂) = 3 Kg
Distance apart (r) = 0.01 m
Gravitational constant (G) = 6.67×10¯¹¹ Nm²/Kg²
Force of attraction (F) =?
F = GM₁M₂ / r²
F = 6.67×10¯¹¹ × 3 × / 0.01²
F = 6.003×10¯¹⁰ / 1×10¯⁴
F = 6.003×10¯⁶ N
Thus the gravitational attraction is 6.003×10¯⁶ N
D. The number of wave that pass a point in a given amount of time
The baseball takes 0.8 s to travel a distance of 20 m at a speed of 25 m/s.
<u>Explanation:</u>
It is known that speed is the rate at which any object covers a particular distance.
So 
Hence, it is known that speed is directly proportional to distance covered and inversely proportionate to the time taken to cover this distance.
Similarly, the time taken by any object to cover a distance is directly proportionate to the distance and inversely proportionate to the velocity of the object.
As the distance is given as 20 m and speed is given as 25 m/s, then the time can be easily obtained by finding the ratio of distance to speed.
Here,
Thus, the baseball takes 0.8 s to travel a distance of 20 m at a speed of 25 m/s.
