The thermal energy used by heater in 3 minutes is used to melt wax.Melting point of solid wax is 60.Specific heat of wax is 220j
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Answer:
a) , b)
Explanation:
The magnitude of torque is a form of moment, that is, a product of force and lever arm (distance), and force is the product of mass and acceleration for rotating systems with constant mass. That is:
Where is the angular acceleration, which is constant as torque is constant. Angular deceleration experimented by the unpowered flywheel is:
Now, angular velocities of the unpowered flywheel at 50 seconds and 100 seconds are, respectively:
a) t = 50 s.
b) t = 100 s.
Given that friction is of reactive nature. Frictional torque works on the unpowered flywheel until angular velocity is reduced to zero, whose instant is:
Since , then the angular velocity is equal to zero. Therefore:
Red Skull's relative velocity to Captain America, towards the left front of the
truck is approximately <u>33.23 m/s</u> in a direction from the North of
approximately <u>9.18°</u>.
Reasons:
Assumptions;
Taking the north direction as positive.
The activity takes place on the trucks.
The trucks are moving towards each other.
Solution:
Vector form of net speed of Red Skull, is given as follows;
- v₁ = -(
× 3.5)·i + (
Vector form of the net speed of Captain America is given as follows;
- v₂ = (
Relative velocity, v₁₂ = v₁ - v₂
∴ v₁₂ = (-( × 3.5) - (
× 4.0))·i + ((
× 3.5 + 12.5) + (
× 4.0 + 15))·j
- v₁₂ =
·i +
·j
Red Skull's velocity relative to Captain America, v₁₂ = ·i +
·j
- v₁₂ ≈ -5.3·i + 32.8·j
Therefore;
- Red Skull appears to be moving West at <u>5.3 m/s</u> and North at <u>32.8 m/s</u>
- The direction is
Therefore;
- Red Skull appear to be moving at 90° - 80.2° ≈ 9.18° towards the left front end of the truck moving North
The magnitude of the velocity, |v₁₂|, is given as follows;
·
The magnitude of Red Skull's velocity relative to Captain America is,
therefore;
|v₁₂| ≈ <u>33.23 m/s</u>
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