Answer:
Explanation:
Pressure at the bottom of the building and at the top of the building must be related as
now we will have
now we have
Answer:c
Explanation:
Given
Object moving towards the motion detector at a constant speed
Constant speed indicates that there is no acceleration .
As the object is moving in a straight line therefore its velocity is same and do not changes with time
thus the correct option is c i.e. a straight line with zero slope.
Solution :
Given :
Mass of grinding wheel, m = 700 g
= 0.7 kg
Diameter of the grinding wheel, d = 22 cm
= 0.22 m
Radius of the grinding wheel, r = 0.11 m
Initial angular velocity of grinding wheel, = 215 rpm
where,
Time taken to stop, t = 50 s
Final angular velocity is = 0
Angular acceleration of the grinding wheel is given by :
Magnitude of the angular acceleration of grinding wheel
Moment of inertia of the grinding wheel (solid disk),
Torque exerted by friction while the wheel is slowing down is
<h2>
Answer:</h2>
|B| = 47.0 units
<h2>
Explanation:</h2>
The sum of two vectors (A) and (B) gives another vector (A + B). i.e
(A + B) = (A) + (B) ----------------(i)
<em>From the question;</em>
Vector A = 28.0 units in the positive y-direction. This means that the value of the x-component is zero and the value of the y-component is +28
In unit vector notation vector A is given as;
A = 0i + 28.0j
Vector A + B = 19.0 units in the negative y-direction. This means that the value of the x-component is zero and the value of the y-component is -19.0
In unit vector notation, vector A + B is given as;
A + B = 0i - 19.0j
To get the magnitude of vector B, make B the subject of the formula in equation (i) as follows;
(B) = (A + B) - (A) ------------------ (ii)
Substitute the values of the vectors (A) and (A + B) into equation (ii) as follows;
(B) = (0i - 19.0j) - (0i + 28.0j)
(B) = - 19.0j - 28.0j
(B) = - 47.0j
The magnitude of B, |B|, is therefore;
|B| = |-47.0|
|B| = 47.0 units
If force = mass x acceleration, and you're walking down the street one day and you see a 20kg rock that is accelerating at 20 m/s², then you can say to yourself:
"Self ! That rock has 20 kg of mass and it's accelerating at 20 m/s², and since force = mass x acceleration, the net force acting on the rock must be (20kg) x (20 m/s²) which is <em>400 Newtons</em>. How strange that 400 N is not one of choices under the question!"