Answer:
Explanation:
Given
Force applied
Door is wide
for gate to revolve Properly Pivot Point must be at center i.e. 1.5 from either end
Torque applied is
Maximum torque
When reporting the speed, we need to include the value, units and direction the object was traveling.
1 answer:
False: when reporting speed, only value and units are needed, not the direction
Explanation:
Let's start by reminding the difference between speed and velocity:
- Speed is a scalar quantity which tells "how fast" an object is moving, regardless of its direction of motion.
It can be calculated as: follows:
where :
d is the distance travelled
t is the time interval
Therefore, speed has no direction, so it is written only as a value followed by units: for example, 5 m/s.
- Velocity is a vector quantity given by:
where :
d is the displacement of the object (which is a vector connecting the initial position to the final position of motion)
t is the time interval
Since it is a vector, velocity has both magnitude and direction, therefore it also takes into account the direction of motion of the object. An example of velocity is 5 m/s east, where the direction is also specificied.
Learn more about speed and velocity:
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Answer:
The kinetic energy of the car at the top of the hill is 140280 Joules.
Explanation:
Mass of the car, m = 620 kg
Speed of the car, v = 24 m/s
Height of the hill, h = 30 m
The engine can produce up to 144,000 J of work during that time, W = 144,000 J
We need to find the kinetic energy of the car at the top of the hill. It can be calculated using conservation of mechanical energy as :
So, the kinetic energy of the car at the top of the hill is 140280 Joules. Hence, this is the required solution.