When a body exerts a force on a second body, the second body exerts a force on the frist body which is equal in magnitude but opposite in direction. This law is known as _______________?
Anonymous Quiz
5%
Newton's 1st law
21%
Newton's 2nd law
70%
Newton's 3rd law
4%
Not exist in any law
β€1
What is the force needed to accelerate a mass of 40kg from velocity Vi = (4i - 5j +3k)m/s to Vf = (8i +3j-5k)m/s in 10s?
Anonymous Quiz
13%
640N
41%
544N
40%
480N
6%
610N
Maths Group11
Even though the ball on the table is at stationery, there are still forces acting on it. What are those forces and how they cancel each other?
Even when a ball is stationary on a table, several forces are acting on it, and these forces can be described as follows:
1. Gravitational Force (Weight): This is the force acting downward due to gravity. It is equal to the mass of the ball multiplied by the acceleration due to gravity (F_gravity = m * g, where g β 9.81 m/sΒ²).
2. Normal Force: This is the force exerted by the table on the ball, acting perpendicular to the surface of the table. The normal force counteracts the gravitational force. When the ball is stationary, the normal force is equal in magnitude and opposite in direction to the gravitational force (F_normal = m * g).
In a state of equilibrium, these two forces cancel each other out:
β’ The gravitational force pulls the ball downward.
β’ The normal force from the table pushes upward.
Since the ball is not moving, the net force acting on it is zero. This means that:
Fβββ = Fββα΅£βββ - F_(gravity) = 0
This balance of forces allows the ball to remain stationary on the table. If any other forces were to act on the ball (like a push or pull), they would need to be considered to understand how they would affect its state of motion.
1. Gravitational Force (Weight): This is the force acting downward due to gravity. It is equal to the mass of the ball multiplied by the acceleration due to gravity (F_gravity = m * g, where g β 9.81 m/sΒ²).
2. Normal Force: This is the force exerted by the table on the ball, acting perpendicular to the surface of the table. The normal force counteracts the gravitational force. When the ball is stationary, the normal force is equal in magnitude and opposite in direction to the gravitational force (F_normal = m * g).
In a state of equilibrium, these two forces cancel each other out:
β’ The gravitational force pulls the ball downward.
β’ The normal force from the table pushes upward.
Since the ball is not moving, the net force acting on it is zero. This means that:
Fβββ = Fββα΅£βββ - F_(gravity) = 0
This balance of forces allows the ball to remain stationary on the table. If any other forces were to act on the ball (like a push or pull), they would need to be considered to understand how they would affect its state of motion.
β€2
Chemistry question
Which of the following is a property of covalent compounds? Covalent
compounds: (2014 EUEE)
A. Is crystalline solids at room temperature.
B. Is generally insoluble in water.
C. Has high melting and boiling points.
D. Is non volatile.
Write your answer under the comment! π
Which of the following is a property of covalent compounds? Covalent
compounds: (2014 EUEE)
A. Is crystalline solids at room temperature.
B. Is generally insoluble in water.
C. Has high melting and boiling points.
D. Is non volatile.
Write your answer under the comment! π
Kinematics Practice Problems in Physics.pdf
194.9 KB
Share Kinematics Practice Problems in Physics.pdf
A cheetah accelerates at 3 m/sΒ² for 5 s. If its final velocity is 24 m/s, then what is its initial velocity?
Anonymous Quiz
58%
9 m/s
16%
39 m/s
20%
16 m/s
5%
5 m/s
If we ignore air resistance then the acceleration of all falling objects can be considered to be uniform.
Anonymous Quiz
77%
True
23%
False
A ball dropped from a height of 4 m. How long would it take to hit the ground?
Anonymous Quiz
17%
3 s
29%
4.5 s
15%
9 s
38%
0.9 s
How long it takes a ball thrown vertically with a velocity of 20 m/s to reach its maximum height and how height it reaches respectively?
Anonymous Quiz
14%
2 s and 14 m
63%
2 s and 20 m
11%
4s and 14 m
11%
4s and 20 m
Which of the following
compounds has a larger lattice
energy, LiCl or CsBr?
Write your answer under the comment! π
compounds has a larger lattice
energy, LiCl or CsBr?
Write your answer under the comment! π
How many moles of HCl are present in 0.8 L of a 0.5 M HCl solution?
Anonymous Quiz
16%
1.6 mol
28%
0.625 mol
15%
1.1 mol
40%
0.4 mol
β€2
How many grams of sodium metal are needed to react with 10.0 g of water?
Anonymous Quiz
37%
12.88 g
33%
113.2 g
25%
56.8 g
5%
41.63 g
Given matrixA with 3 Γ 4 size, matrix B with 4 Γ 6 size and matrix C with 6 Γ 3 size. Then which of the following is multiplication of matrices impossible?
Anonymous Quiz
18%
AB
32%
BC
40%
AC
11%
CA
What is the direction of flow of electrons in an electrolytic cell?
Anonymous Quiz
31%
Anode to cathode internally
24%
Cathode to anode externally
20%
Cathode to the anode in the solution
25%
Anode to cathode externally
π1
By the end of this month we__________ our frist final exam.
Anonymous Quiz
23%
will complete
22%
will be completed
40%
will have completed
15%
will have been completed
π5