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What is matter?

What is Heat ?

Suppose a manufacturing plant has an average sound intensity of 97.0db created by 25 identical machines. Find

Which costs more, running a 1,200 W hairdryer for 3 min or leaving a 60-W lamp on overnight (1h)?

Compare and contrast velocity and speed?

A 42 V power supply is connected to three resistors in parallel. The total current through the circuit is 0.67 A. If the first resistor is 285 Ohms and the second is 569 Ohms, what is the value of the third? Round your answer to 2 decimal places.

A battery is used in an experiment and is connected by a 32.5 cm long gold wire with a diameter of 0.820 mm. If the battery has a voltage of 0.900 V and the resistivity of the wire is 2.4×10^-8 Ω m, what is the current in the wire?

A rocket, with a mass of 1800 kg, accelerates upwards at 85.0 m/s/s. Unfortunately, it explodes 2.5 s after take off into two different size pieces. One piece is two times as massive as the other piece. Radar evidence showed the smaller piece traveled at an angle of 10.0o from the original trajectory of the rocket, in a westerly direction, to a height of 9000 m. The larger piece was not recorded and saved by radar as a result of a malfunction.
a). Determine the speed and direction of the larger, two times as massive, piece?
b). How far, and in what direction from the launch site, should the search time look to find the larger piece?

The starting motor of an automobile is turning too slowly, and the mechanic has to decide whether to replace the motor, the cable, or the battery. The manufacturer's manual says that the 12 V battery should have no more than 0.020 Ω internal resistance, the motor no more than 0.200 Ω resistance, and the cable no more than 0.040 Ω resistance. The mechanic turns on the motor and measures 11.4 V across the battery, 3.0 V across the cable, and a current of 50 A. which part is defective?

You kick a soccer ball, compressing it suddenly to 2/3 of its original volume. In the process, you do 410 J of work on the air (assumed to be an ideal gas) inside the ball. a) What is the change in internal energy of the air inside the ball due to being compressed? b) Does the temperature of the air inside the ball rise or fall due to being compressed? Explain.

You kick a soccer ball, compressing it suddenly to 2/3 of its original volume. In the process, you do 410 J of work on the air (assumed to be an ideal gas) inside the ball.
(a) What is the change in internal energy of the air inside the ball due to being compressed?
(b) Does the temperature of the air inside the ball rise or fall due to being compressed? Explain.

A rocket starts from rest and moves upward from the surface of the earth. For the first 10.0 s of its motion, the vertical acceleration of the rocket is given by 𝑎𝑦 = (2.80 𝑚𝑠 3) 𝑡, where the +y direction is upward. a) What is the height of the rocket above the surface of the earth at 𝑡 = 10.0𝑠? b) What is the speed of the rocket when it is 325 m above the surface of the earth?

Q1.Two identical batteries, each with an emf of 18 V and internal resistance of 1 Ohm, are wired in parallel by connecting their positive terminals together and connecting their negative terminals together. The combination is then wired across a 4-Ohm resistor. The current in each battery is: (Answer: 2.0 A).

Q2. A single loop of wire with a radius of 7.5 cm rotates about a diameter in a uniform magnetic field of 1.6 T. To produce a maximum of 1.0 V, it should rotate at: (answer: 35 rad/s).

A small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, the boat sinks an additional 4.40 cm into the river. What is the weight of the truck?

What is the weight of the truck in (N)?

How long would a charge of 600 coulombs take to move round a circuit a steady rate of 12 C/s?

A laser emits a beam of light whose photons all have the same frequency. When the beam strikes the surface of a metal, photoelectrons are ejected from the surface. What happens if the laser emits twice the number of photons per second?

(a) The photoelectrons are ejected from the surface with twice the maximum kinetic energy.
(b) The photoelectrons are ejected from the surface with the same maximum kinetic energy.
(c) The number of photoelectrons ejected per second from the surface doubles.
(d) Both b and c happen.
(e) Both a and c happen.

When switch S in the figure is open, the voltmeter V of the battery reads 3.08 . When the switch is closed, the voltmeter reading drops to 2.98 , and the ammeter A reads 1.64 . Assume that the two meters are ideal, so they don't affect the circuit.

a) Find the emf.

b) Find the internal resistance of the battery

c) Find the circuit resistance .

Two boxes, A and B, are connected to each end of a light vertical rope, as shown in the following figure. A constant upward force 80.0 N is applied to box A. Starting from rest, box B descends 10.8 m in 3.20 s. The tension in the rope connecting the two boxes is 40.0 N What are the masses of (a) box B, (b) box A?

A typical nuclear reactor generates 1000MW (1000MJ/s) of electrical energy. In doing so, it produces 2000MW of "waste heat" that must be removed from the reactor to keep it from melting down. Many reactors are sited next to large bodies of water so that they can use the water for cooling. Consider a reactor where the intake water is at 18∘C. State regulations limit the temperature of the output water to 30∘C so as not to harm aquatic organisms. How many liters of cooling water has to be pumped through the reactor each minute?

Three long, straight wires (Figure 1.5) are carrying currents that have the same magnitude. In C the current is opposite to the current in A and B. The wires are equally spaced. Each wire experiences a net force due to the other two wires. Which wire experiences a net force with the greatest magnitude? (A) A (B) B (C) C (D) All three wires experience a net force that has the same magnitude.

Suppose photon of light A has a higher frequency than photon B. Which have a longer wavelength and the highest energy?

a. A has the longest wavelength and the highest energy
b. A has the longest wavelength and B has the highest energy
c. B has the longest wavelength and A has the highest energy
d. B has the longest wavelength and B has the highest energy

What current is needed to generate the magnetic field strength of 5.0 x 10^-5 T at a point 1.3cm from a long, straight wire?

An ac generator with peak voltage 100 volts is placed across a 10 ohm reisitor. What is the average power dissipated?

Waterfalls without splashing at a rate of 0.310 L/s from a height of 3.10 m into a 0.710-kg bucket on a scale. If the bucket is originally empty, what does the scale read 2.90 s after the water starts to accumulate in it?

The force that is responsible for holding the nuclear particlestogether is the



a. strong force that is effective at long distances.

b. electrical forces between the protons and neutrons.

c. gravitational force.

d. strong force that is effective only at very small distances.

A copper wire of cross-sectional area carries a constant current of 5A. The density of free electrons is electrons per cubic meter. Find the current density and drift velocity of electrons in copper wire. Also, find the electric field and potential difference between two points 100cm apart.

why was i incorrect? i dont get it, help please

The fundamental frequency of a 28.5 cm string is 624 Hz. If the same string is shortened to 19.7 cm, then the fundamental frequency would be _____ Hz.

Consider a box that is placed on different surfaces.

a) In which situation (s) is there no force acting on the box?
b) In which situation (s) is there a static friction force acting on the box?
c) In which situation (s) is there a kinetic friction force acting on the box?

Various possible situations are as under:

I. The box is at rest on a rough horizontal surface.
II. The box is at rest on a rough tilted surface.
III. The box is on the rough-surfaced flatbed of a truck- the truck is moving at a
constant velocity on a straight, level road and the box remains in the same
place in the middle of the truck bed.
IV. The box is on the rough-surfaced flatbed of a truck- the truck is speeding up
on a straight, level road, and the box remains in the same place in the middle of
the truck bed.
V. The box is on the rough-surfaced flatbed of a truck- the truck is climbing a
hill and the box is sliding towards the back of the truck.

A physics major is cooking breakfast when she notices that the frictional force between her steel spatula and Teflon frying pan is only 0.200 N. Knowing the coefficient of kinetic friction between the two materials, she quickly calculates the normal force. What is it?

I need some help with this question. I’ll leave a great rating

how do i determine phase difference of two interfering waves that may differ in path length or phase? is there a formula for it?

A mass is attached to a spring of spring constant 60 N/m along a horizontal, frictionless surface. The spring is initially stretched by a force of 5.0 N on the mass and let go. It takes the mass 0.50 s to go back to its equilibrium position when it is oscillating. What is the amplitude and period of acceleration?

2 examples

a string vibrates according to the equation y=2.57sin(1.14x)cos(137t)

where x and y are in centimeters and t in seconds.

a) what are the amplitude and speed of the component wave whose superposition can give rise to this vibration.

b) Find the distance between nodes.

c) what is the displacement of the resultant standing wave at x=5 m, t= 2s?

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A 0.0500 Kg lead bullet of volume 5×10^-6 m^3 at 20 °C hits a block that is made of an ideal thermal insulator and comes to rest at its center at that time the temperature of the bullet is 327°C what is the volume of the bullet when it comes to rest? Coefficient of linear expansion =  

The hill in the picture is 5 meters high, how fast is the hoop traveling at the bottom?