Answer:
The force of friction.
Explanation:
Gravity keeps the car on the ground.
Motion Allows the car to move.
The force of speed doesnt make sense.
Friction would cause the car to stop moving.
Answer:
<h3>6.80kg, 6.70kg and 6.90kg.</h3>
Explanation:
To get the set of measurements that best represents accuracy if the true value is 6.80 kg, we will find the mean of the set of numbers and chech which is equal to 6.80kg
According to the set of data 6.8kg, 6.7kg and 6.9kg
Mean = sum of the number/sa mple size
Sum of the numbers = 6.8+6.7+6.9 = 20.4
sample size = 3
Mean of the set of measurement = 20.4/3
Mean of the set of measurement is 6.80kg
Since the answer is 6.8kg, hence set of measurements that best represents accuracy are 6.80kg, 6.70kg and 6.90kg.
W = weight of the body in air = 160 N
ρ' = density of body
V = volume of the body
weight of the body in air is given as
W = ρ' V g eq-1
W' = weight of the body in liquid = 120 N
force of buoyancy is given as
F = W - W'
F = 160 - 120
F = 40 N
ρ = density of liquid = ?
force of buoyancy is given as
F = ρ V g eq-2
dividing eq-1 by eq-2
160/40 = ρ' V g /(ρ V g )
4 = ρ' /(0.8 )
ρ' = 3.2
(b)3.2