In science class, students constructed an explanation on the composition of soil. Which student offered the BEST explanation? (A
KS 2e)
!!!(The file has the image)!!!
Answer choices:
A.
Student A
B.
Student B
C.
Student C
D.
Student D
!!!(The file has the image)!!!
Answer choices:
A.
Student A
B.
Student B
C.
Student C
D.
Student D
2 answers:
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Answer:
Work done is zero
Explanation:
given data
Angle of kite with horizontal = 30 degree
tension in the string = 4.5 N
WE KNOW THAT
Work = force * distance
horizontal force =
DISTANCE = 0 as boy stands still. therefore
work done = 3.89 *0 = 0
Answer:
a) 37171
b) sec
Explanation:
m = mass of the weight being lifted = 60.0 kg
d = distance by which the weight is lifted = 0.670 m
E = Energy available to burn = 1 lb = 3500 kcal = 3500 x 4184 J
g = acceleration due to gravity = 9.8 m/s²
n = number of times the weight is lifted
Energy available to burn is given as
E = n m g d
3500 x 4184 = n (60) (9.8) (0.670)
n = 37171
b)
T = time period for each lift up = 1.80 s
t = total time taken
Total time taken is given as
sec