Answer: -6.67 m/s²
Explanation:
Given that,
Initial velocity of car (Vi) = 60 m/s
Final velocity of car (Vf) = 20 m/s
Time taken (T) = 6 seconds
Deceleration (A) = ?
Deceleration is the rate of change of velocity per unit time as the car prepares to rest (slows down)
i.e Deceleration = (Vf - Vi)/T
A = (20 m/s - 60km/s) / 6 seconds
A = -40 m/s / 6 seconds
A = -6.67 m/s² (The negative sign indicates that the car is slowing down)
Thus, the deceleration of the car is -6.67m/s²
Answer:
The length of line is 78 cm or 0.78 m.
Explanation:
initial reading 2 mark
final reading 80 cm
The length of the line
= final reading - initial reading
= 80 - 2
= 78 cm
1 cm = 0.01 m
So, 78 cm = 0.78 m
Answer:
A hydraulic lift for automobiles is an example of a force multiplied by hydraulic press, based on Pascal's principle. The fluid in the small cylinder must be moved much further than the distance the car is lifted.
Answer:
How much electricity the appliance can hold, the number of hours the appliance is used in a day, and how many days it is used of the year.
Explanation:
Once we find all these things its simple math to figure out how many watts the appliance uses.
Answer:
Question 19: 4. -2
Question 20: 1. -1
Explanation:
Protons always have a positive (+) charge.
Neutrons always are a neutral (0) charge, or no charge.
Electrons always have a negative (-) charge.
<u>Question 19:</u>
We have 8 protons, so a +8 charge.
We also have 10 electrons, so a -10 charge.
-10 + 8 = -2, or a -2 charge.
<u>Question 20:</u>
We have 1 proton, so a +1 charge.
We also have 2 electrons, so a -2 charge.
1 - 2 = -1, or a -1 charge.