Answer:
B
Explanation:
Heat increase molecular motion
Answer:
Distance, S = 440 meters.
Explanation:
Given the following data;
Initial velocity, u = 17m/s
Time, t = 20 seconds
Final velocity, v = 27m/s
To find the distance;
First of all, we would determine the acceleration of the truck.
Acceleration = (v-u)/t
Substituting the given values into the equation, we have;
Acceleration = (27 - 17)/20
Acceleration = 10/20
Acceleration = 0.5m/s²
Now, we would use the second equation of motion to find the distance traveled.
S = ut + ½at²
S = 17*20 + ½*0.5*20²
S = 340 + 0.25*400
S = 340 + 100
S = 440m
Answer:
A. The ball has a negative acceleration on the way up and a positive acceleration on the way down.
Explanation:
- When a ball is thrown up vertically then the acceleration due to gravity always acts in a direction towards the center of the earth. So here when an object is thrown vertically upwards then the acceleration due to gravity acting in a downward direction which is opposite to the direction of motion of the object hence taken as negative with respect to the displacement.
- When the ball reaches at the top height its speed becomes zero and then it returns back towards the earth. While coming down the direction of the object's displacement is same as the direction of acceleration due to gravity.
The maximum height the ball reaches is 100ft.
Answer:
Explanation:
magnetic flux is the count of magnetic field lines passing through a given loop or area
As we know that magnetic flux is given by the formula
here we also know that magnetic field B and plane of the coil is perpendicular in initial position
So the area vector is always perpendicular to the plane of the coil
so the angle between magnetic field and area vector is parallel to each other and this angle would be zero
so magnetic flux of the coil initially we have