a ball is thrown striaght up in the air and then falls back to earth. if the downward fall takes 2.2s, how fast is the ball trav
1 answer:
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Answer:
Technician A is right.
Explanation:
Given that,
Voltage of circuit, V = 12 volt
Current in the circuit, I = 3 A
Technician A says the electric power in this circuit is 36 watts. Technician B says the electric power in this circuit is 4 watts. We need to say that which technician is correct.
The power of any circuit is given by :
P = 36 watts
So, technician A is right. Hence, this is the required solution.
Answer:
X component of force is 60.62 N.
Y component of force is 35 N.
Force of gravity on the dog is 245 N.
Magnitude of normal force is 210 N.
Explanation:
Given:
Force of pull is,
Mass of the dog is,
Angle of inclination is, °
Acceleration due to gravity is,
The free body diagram of the dog is shown below.
The X and Y components of force of pull is given as:
Therefore, the X and Y components of the force are 60.62 N and 35 N respectively.
Force of gravity on the dog is the product of its mass and acceleration due to gravity. Thus,
Therefore, the force of gravity on the dog is 245 N.
Now, consider the motion in the vertical direction of the dog. As there is no motion in the vertical direction, the net force along the Y direction is 0. In other words, the total Upward force is equal to the total downward force.
From the free body diagram,
Therefore, the normal force acting on the dog is 210 N.
Explanation:
Given that,
Rate of cooling of air
Initial temperature= 80°C
Final temperature = 5°C
We need to calculate
Using newton's law of cooling
Where,
Here,
= 25°C (surrounding temperature)
dt = 1 minute
Put the value into the formula
Hence, This is the required answer.