1. The current in two straight, parallel, fixed wires are in the same direction. If currents in the both wires are doubled, the magnitude of the magnetic force between the two wires A) decreases, (B) remain the same, C) doubles, D) quadruplicates, E) no solution.
Kinematics
A machine is a device that accepts energy in some available form and utilizes it to do a type of work. Energy, work, or power has to be transferred from one mechanical part to another to run a machine. While the transfer of energy between two machine parts, those two parts experience a relative motion with each other. Studying such relative motions is termed kinematics.
Kinetic Energy and Work-Energy Theorem
In physics, work is the product of the net force in direction of the displacement and the magnitude of this displacement or it can also be defined as the energy transfer of an object when it is moved for a distance due to the forces acting on it in the direction of displacement and perpendicular to the displacement which is called the normal force. Energy is the capacity of any object doing work. The SI unit of work is joule and energy is Joule. This principle follows the second law of Newton's law of motion where the net force causes the acceleration of an object. The force of gravity which is downward force and the normal force acting on an object which is perpendicular to the object are equal in magnitude but opposite to the direction, so while determining the net force, these two components cancel out. The net force is the horizontal component of the force and in our explanation, we consider everything as frictionless surface since friction should also be calculated while called the work-energy component of the object. The two most basics of energy classification are potential energy and kinetic energy. There are various kinds of kinetic energy like chemical, mechanical, thermal, nuclear, electrical, radiant energy, and so on. The work is done when there is a change in energy and it mainly depends on the application of force and movement of the object. Let us say how much work is needed to lift a 5kg ball 5m high. Work is mathematically represented as Force ×Displacement. So it will be 5kg times the gravitational constant on earth and the distance moved by the object. Wnet=Fnet times Displacement.
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1. The current in two straight, parallel, fixed wires are in the same direction. If currents in tne bo
wires are doubled, the magnitude of the magnetic force between the two wires
A) decreases, (B) remain the same.
on
C) doubles, D) quadruplicates,
E) no solution.
CTOScope
2. Each diagram below represents a cross section of a long, straight, current-carrying wire with the
current direction into the page. Which diagram best represents the magnetic field near the wire?
Jon
n
A)
A) A,
В) В,
C) C,
D) D,
E) no solution
B)
C)
D)
3. Which statement is well defined and correct ?
A) 5 m is less than 10 kg,
D) 5 m² is less then 10 m, E) 5 kHz is less than 10 MHz
B) 5 cm is less than 10 mm, C) 5 mg is less than 10 µg,
int
4. Symbol p in the Physics formula p=mv represents:
B) power,
momentum,
C) phosphorus,
D) pressure,
E) dipole moment.
5. The volume of an ideal gas is increased from 10m to 20m' while maintaining a constant
pressure of 1000 Pa (1 Pa = 1 N/m2). How much work is done by the gas in this expansion?
A) 3kJ
ne
B) 7kJ
C) 10kJ
D) 200kJ
E) No solution
6. Symbol f in the Physics formula 1/o + 1/i = 1/f represents:
A) net force, B) fluid pressure, C) frequency,
D) friction,
E) focal length,
7. What does the symbol c mean in the Physics formula: Q = cmAT?
A) speed of light, B) specific heat capacity, C) centripetal acceleration,
D) conductivity, E) coulomb.
8. What is the weight of 70-g mass ( on the surface of the Earth)?
B) 0.07 g
A) 0.7 kN
C) 7 N
D) 700 N
E) 0.7 N
9. An object has a weight of 18N when it is locates on the surface of the Earth. What would it
weight (the gravitational force due to the Earth) be if the object tripled its distance from the
center of the Earth by flying in a spacecraft?
A) 1 N
B) 2 N
C) 3 N
D) 6 N
E) 1.8 kg
10. To stretch a spring a distance of 0.2 m, 40 J of work is done. What is the value of the spring
constant k of the spring.
A) 2 kN / m
C) 0.005 m' kg' s
D) 200 newtons
E) No solution
B) 8m J
11. Ten coulombs of positive charge flow from the +9 V positive terminal of a battery to the
negative terminal at +3 V. What is the change in potential energy of the charge?
A) 90 J
C) 60 J
D)-60 J
E) No solution
B) 30 J
12. A 10-2 resistor has a voltage difference of 2 V across its leads. What is the power being
dissipated in this resistor?
A) 0.4W
D) 40W
E) No solution
B) 20W
C) 0.2W
frequency of a sound wave with a wavelength of 0.34 m traveling in room-temperature](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F985af285-efb7-4acb-9270-22ff0d175d84%2F0f6b6755-c925-4072-8fc9-858f34e43600%2Fd9wevno_processed.jpeg&w=3840&q=75)
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