Answer:
Unknown mass,
Explanation:
From the figure below,
OE is a meter scale with markings in centimeter.
A is the position of unknown mass m, B is the position of 90 g mass, C is the fulcrum, D is the position of mass 73 g.
Length AC = 40 cm, BC = 10 cm, CD = 20 cm
For equilibrium of the meter scale,
Sum of anti-clockwise moments = Sum of clockwise moments
Therefore,unknown mass is 14 g.
Answer:
The power drawn by the toaster is closest to:
(A) 370 W
Explanation:
First we calculate the resistance of the nichrome wire (R).
Where radious (r), resistance coefficient (p), and Length (L)
After replace the value in the ohm law power formula to obtain the power consumed:
Answer:
v = -1.8t+36
20 seconds
360 m
40 seconds
36 m/s
The object speed will increase when it is coming down from its highest height.
Explanation:
Differentiating with respect to time we get
a) Velocity of the object after t seconds is v = -1.8t+36
At the highest point v will be 0
b) The object will reach the highest point after 20 seconds
c) Highest point the object will reach is 360 m
d) Time taken to strike the ground would be 20+20 = 40 seconds
Acceleration will be taken as positive because the object is going down. Hence, the sign changes. 2 is multiplied because the expression is given in the form of
e) The velocity with which the object strikes the ground will be 36 m/s
f) The speed will increase when the object has gone up and for 20 seconds and falls down for 20 seconds. The object speed will increase when it is coming down from its highest height.