Answer:
3.2 kg
Explanation:
From Newton's second law of motion:
, where F is the force needed to give a mass m an acceleration a. Here, we have F = 16N and a = 5 m/s². Substituting those values in to our formula gives us 16N = (5 m/s²)m, and solving for mass gives us 16/5 = 3.2 N/(m/s²).
Since a Newton is defined with the units kg·(m/s²), the units of acceleration in the numerator an denominator cancel, leaving us just with units of mass, so our mass is exactly 3.2 kg.
Your hair will have a positive charge and the comb has a negative charge...
Answer:
The speed of the raft is 1.05 m/s
Explanation:
The equation for the position of the stone is as follows:
y = y0 + v0 · t + 1/2 · g · t²
Where:
y = height of the stone at time t
y0 = initial height
v0 = initial speed
t = time
g = acceleration due to gravity
The equation for the position of the raft is as follows:
x = x0 + v · t
Where:
x = position of the raft at time t
x0 = initial position
v = velocity
t = time
To find the speed of the raft, we have to know how much time the raft traveled until the stone reached the river. For that, we can calculate the time of free fall of the stone:
y = y0 + v0 · t + 1/2 · g · t² (v0=0 because the stone is dropped from rest)
If we place the origin of the frame of reference at the river below the bridge:
0 m = 95.6 m - 9.8 m/s² · t²
-95.6 m / -9,8 m/s² = t²
t = 3.12 s
We know that the raft traveled (4.84 m - 1.56 m) 3.28 m in that time, then the velocity of the raft will be:
x/t = v
3.28 m / 3.12 s = v
v = 1.05 m/s
Energy is carried to Earth in a form of photons or simple radiation.
Answer:
Heat flow is the movement of heat.
Explanation:
Heat flows in solids by conduction, which occurs when two objects in contact with each other transfer heat between them. That happens because the molecules hit each other, and the faster moving molecules in the hot object spread that energy into the cooler object
Credit to, https://study.com/academy/lesson/heat-flow-in-solids-fluids.html