Answer:
F= 5.71 N
Explanation:
width of door= 0.91 m
door closer torque on door= 5.2 Nm
In order to hold the door in open position we need to exert an equal and opposite torque, to the door closer torque, on the door.
so wee need to exert 5.2 Nm torque on the door.
If we want to apply minimum force to exert the required torque we need to apply force perpendicularly on the door knob (end of door) so that to to greater moment arm.
T= r x F
T= r F sin∅
F= T/ (r * sin∅)
F= 5.2/ (0.91 * 1)
F= 5.71 N
Answer:
The electrical energy consumed by a toaster is 0.033 Kwh.
Explanation:
The power utilized by the toaster is 400 W.
The toaster is operated for 5 Minutes.
We know that,
Substitute the values in the above formula to obtain electrical energy,
Electrical energy = 0.4 × 0.083
Electrical energy is 0.033 Kwh.
Answer:
- B. The statement is false. The vector v1 could be the zero vector.
Explanation:
Two vectors and are linearly independent if the equation
where and are scalars, has only one solution:
.
If there is more than one solution, we say that the vector are linearly dependent.
<h3>Why the answer is B. :</h3>
if then, could have any value of the scalar group, as for any scalar
So, we get that there is more than one solution.
So, a particular counterexample is:
as is not an scalar multiple of , and the equation
has as solution
as we can see
Answer: D) The gravity on the moon is one sixth the gravity of Earth.
Explanation:
Mechanical advantage = ideal mechanical advantage x efficiency = 3.5 * 0.6= 2.1.
The mechanical advantage of the inclined plane is 2.1.
Hope this helps!
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