D
hydrosphere-- anything to do with water
geosphere -- the rocks and soil
topsoil (geosphere) is eroded by rainwater(hydrosphere)
Answer:
Therefore,
We can use Computer to surf internet for 5.7 hours.
Explanation:
Given:
For Clothes Dryer,
Current, I = 14 A
Voltage, V = 240 V
Time, t = 33 min = 33 × 60 = 1980 s
For Computer,
Current, I = 2.7 A
Voltage, V = 120 V
To Find:
Time, t = ? For Computer to surf with the Energy of Clothes Dryer,
Solution:
According to Joule's Law, Energy in joules for voltage "V" and Current "I" for time "t" second is given as,
For Clothes Dryer
Substituting the values we get
Now for Computer we have E = 6652.8 kJ, then time will be
Again we have,
Substituting the values we get
Time in Minutes,
Time in hours again we have to divide minutes by 60
Therefore,
We can use Computer to surf internet for 5.7 hours.
Answer:
a. 156.41m
b. directly over the target
Explanation:
a) At the point of release, the weight will have:
Horizontal:
velocity of 40m/s (same as the plane)
Acceleration of zero since it is not under the influence of any force.
Vertical:
initial Velocity - zero at this instant
Acceleration - Towards the ground with g (9.81m/s^2)
from newton's equation of motion, since its falling under gravity, the horizontal component wont be involved
s = ut + (1/2)at^2
u = initial velocity
a = acceleration
s = displacement
t = time taken
75 = 0 + (1/2)(9.81)t^2
t^2=15.29
t=3.91
t = 3.91s
Applying the time of flight to the horizontal components:
Distance = speed x time
= 40 x 3.91
= 156.41m
B) The pilot looks down at the weight after she drops it. Where is the plane located at the instant the weight hits the ground?
not yet over the target
past the target
directly over the target
not enough information to determine
c. directly over the target. will be the correct answer
Yes Convex Lens Can form virtual images which are magnified, provided the object distance, measured from the optical centre must be less than focal length.
For your question,
let focal length, f = + 6 cm
let object distance be 'u'
let image distance be 'v'
magnification required, m = +3, +ve because image will be erect, according to the property of convex lens: