Answer:
W = 725 J
Explanation:
given,
mass of wagon = 20 kg
distance of pull = 40 m
angle made with the horizontal = 25°
tension force on the wagon = 20 N
Work done = ?
Horizontal component of the force will help in movement of the wagon.
Horizontal component of force=
F_x = F cos θ
Work done is equal to force into displacement
W = F.s
W = F cos θ.s
W = 20 cos 25° x 40
W = 725 J
hence, work done on pulling the wagon is equal to W = 725 J
Answer:
The tires make 125 revolutions before the car stops
Explanation:
Circular and Linear Motion
A tire rotates around a fixed point and the tire when in contact with the ground, drives a vehicle in a linear path. This is an example of a relationship between both types of movements that can be taking place simultaneously.
The car is moving with an initial speed of 
and then breaks at 
until it stops. We can compute the time take to stop by using
Solving for t
Putting in numbers
Now, let's transfer this information to the circular motion. We know the tangent speed is
Being w the angular speed and r the radius of the circle, in this case, the tires. The tangent speed is the same as the speed of motion of the car. It gives us the initial angular speed
When the circular motion is not uniform, i.e. there is angular acceleration 
, the angular speed is a function of time
We can compute the angular acceleration knowing the final angular speed is zero when the car stops.
The rotation angle is also a function of time as shown
Using the given and computed values
Knowing each revolution is 
radians, the number of revolutions is
The tires make 125 revolutions before the car stops
Answer:
Is the amount of water evaporated in a day more significant than the amount of rain falling in a day?
Explanation:
Don't overcomplicate it
The current values in and out of the battery is going to be equal to the sum of the currents going through the light bulbs. In a parallel circuit, the current is divided as it enters different branches and light bulbs. However, the amount of current leaving the battery is always going to be the same as the amount of current entering the battery. Therefore, while current divides in a parallel circuit, the total amount of current always remains the same.
<h2>Answer:</h2>
<u>The number of neutrons is </u><u>47</u>
<h2>Explanation:</h2>
In order to find the number of neutrons we subtract the atomic number from the atomic mass.
In the given case the atomic number is 23 and mass number is 70 so
No of neutrons is 70 -23 = 47
