Answer:
the charge that is given by the object is positive charge and the object which is taking the charge is negetively charged
Explanation:
The displacement of the bird is 1.8 km...because displacement is the distanse of the object from mean position to the travelled position.....hope it helps
C. a truck rolling down hill
Answer:
1) 
2) a. 
b. 
c. 
Explanation:
1)
- given initial length,

- initial temperature,

- final temperature,

- coefficient of linear expansion,

<u>∴Change in temperature:</u>


We have the equation for change in length as:



2)
Given relation:

where:
= change in volume
V= initial volume
=change in temperature
- initial volume of tank,

- initial volume of gasoline,

- initial temperature of steel tank,

- initial temperature of gasoline,

- coefficients of volumetric expansion for gasoline,

- coefficients of volumetric expansion for gasoline,

a)
final temperature of gasoline, 
∴Change in temperature of gasoline,



Now,



b)
final temperature of tank, 
∴Change in temperature of tank,



Now,



c)
Quantity of gasoline spilled after the given temperature change:



Answer:2.69 cm/s
Explanation:
We know that drag force
Fd=6 πμ r v
μ=Dynamic viscosity
r=radius
v=terminal velocity
Bouncy force
Fb= ρ V g

V=volume
At the condition of terminal velocity
when going down ( aluminum)

---------1
when going up ( air)

-----------2
m =mass of object



Divide 1 and 2


divide by
in R.H.S

