Answer:
8000 kg/m^3
Explanation:
Weight in air = 7.84 n
Weight in water = 6.86 N
density of water = 1000 kg/m^3
Let d be the density of object
According to the Archimedes principle, when a body is immersed in a liquid partly or wholly, it experiences an upward force which is called buoyant force. The buoyant force is equal to the loss in weight of the body.
Loss in weight of the object = Weight of object in air - weight of object in water
Loss in weight = 7.84 - 6.86 = 0.98 N
Volume of body x density of water x g = 0.98
Let V be the volume of body
V x 1000 x 9.8 = 0.98
V = 10^-4 m^3
Weight in air = Volume of body x density of body x g
7.84 = 10^-4 x d x 9.8
d = 8000 kg/m^3
Thus, the density of body is 8000 kg/m^3.
<h2>
Answer:</h2>
6C
<h2>
Explanation:</h2>
The quantity of charge, Q, passing through an electric circuit is dependent on the electric current, I, and the time taken, t, for the current to flow. It is given mathematically as follows
Q = I x t ------------------------------(i)
Where;
I is measured in Amperes(A)
t is measured in seconds (s)
Q is measure in coulombs (C)
<em>From the question,</em>
I = 3A
t = 2s
<em>Substitute these values into equation (i) as follows;</em>
Q = 3 x 2
Q = 6C
Therefore, the number of coulombs of charge that will pass is 6C
Answer:
the average net force on the truck is 3744 N.
Explanation:
Given;
mass of the truck, m = 1200 kg
initial velocity of the truck, u = 25 m/s
final velocity of the truck, v = 53 m/s
distance traveled by the truck, d = 350 m
The acceleration of the truck is calculated as;
v² = u² + 2ad
53² = 25² + (2 x 350)a
700a = 53² - 25²
700a = 2184
a = 2184 / 700
a = 3.12 m/s²
The average net force on the truck is calculated as;
F = ma
F = 1200 x 3.12
F = 3744 N
Therefore, the average net force on the truck is 3744 N.
Acceleration is measured in m/s².
Answer: m/s²
The person applying a greater pressure to the box is Cindy since it takes her a lesser time to move the box up the hill.
<h3>What is pressure?</h3>
The term pressure is defined as the force per unit area. WWe know that the magnitude of force applied is shown by the time taken to push the box up the hill.
Since Cindy pushes the box up the hill in only five seconds, it means that Cindy is applying a greater pressure to the box.
Learn more about pressure: brainly.com/question/356585