Explanation:
Cold butter placed on hot corn melts because of convection. Butter placed on hot corn melts because it touches the hot corn. Most of the heat is transferred through conduction
Answer:
480N
Explanation:
A ball is moving a speed of 8 there fore it had to be add force opposite direction to the ball if it takes to rest. There for ball is subjected to deceleration. First we can find the deceleration
V = U + at
0 = 8 + a×10
a= 0.8 m /s²
Then we can apply newton's 2nd law to determine the force acted by legatos
F= ma
F= 600×0.8
= 480 N
<u>Answer:</u> The density of boat is 
<u>Explanation:</u>
To calculate the volume of boat, we use the equation:
where,
V = volume of boat
l = length of boat = 2.00 cm
b = breadth of boat = 11.0 cm
h = height of boat = 11.0 cm
Putting values in above equation, we get:
- To calculate density of a substance, we use the equation:
We are given:
Mass of boat = 213 g
Volume of boat = 
Putting values in above equation, we get:
Hence, the density of boat is
Answer:
a. 2.959kgm/s
b. 7.63kgm/s
Explanation:
We were given Mass= 0.25kg
Velocity = 13m/s
Angle = 46°
a) Along the x axis we have =
0- 0.25(13)cos(46°) = (- 2.26)i kgm/s
Along the y axis we have =
-0.25(20) +0.25(13)sin(46°) = (-1.91)j kgm/s
Magnitude of change in momentum
=√ i²+ j²
= √ (-2.26)²+ ( -1.91)²
= √8.7557
= 2.959 kgm/s
b.
Along the x axis
-0.25(20) - 0.25(13)cos(46°) = (-7.26)i kgm/s
Along the y axis
0 + 0.25(13)sin(46°) = (-2.34)j kgm/s
Magnitude of change in momentum
= √ i²+ j²
= √( -7.26)² + (-2.34)²
= √58.1832
= 7.63kgm/s
