When the wire is twice as long. Also when the cross sectional area is halved
Answer:
A. 0.25 A
B. 4.5 V
Explanation:
A. The total resistance of resistances in series is:
R = R₁ + R₂
R = 18 Ω + 18 Ω
R = 36 Ω
Ohm's law:
V = IR
9 V = I (36 Ω)
I = 0.25 A
B. The voltage across the bulb (between P and the battery) can be found with Ohm's law.
V = IR
V = (0.25 A) (18 Ω)
V = 4.5 V
Answer:
1) A downward force of magnitude 5 N is exerted on the book by the force of of gravity
2) An upward force of magnitude 5 N is exerted on the book by the table
Explanation:
First of all, any object near the Earth's surface experiences the forces of gravity, which is also called weight of the object. This force always acts downward.
For the book in the problem, the magnitude of the weight is 5 N.
We also know that the book is at rest: this means that the net force acting on it is zero, and there must be another force balancing the weight, in order to give a zero net force. This other force is the reaction force exerted by the table on the book: the magnitude of this force must be equal to the force of gravity (so, 5 N) and its direction is opposite to the weight, therefore upward.
Answer:
<em>Before the parachute opens: Immediately on leaving the aircraft, the skydiver accelerates downwards due to the force of gravity. There is no air resistance acting in the upwards direction, and there is a resultant force acting downwards. The skydiver accelerates towards the ground.</em>
<em>Once the parachute is opened, the air resistance overwhelms the downward force of gravity. The net force and the acceleration on the falling skydiver is upward. An upward net force on a downward falling object would cause that object to slow down. The skydiver thus slows down.</em>
<h3>
I HOPE THIS WILL HELP YOU IF NOT THEN SORRY</h3>
HAVE A GREAT DAY :)
9 is D I believe, I don't know about 10
