Q: If air is a bad conductor of heat, why do we not feel warm without clothes?
A: Air is a bad conductor of heat because molecules are not close together as in solids. Thus, heat tra...
Q: A drop of liquid under no external forces is always spherical in shape.
A: The least amount of energy state is the most stable condition for any system. In order to avoid the ...
Q: My Questions | bartleby Course Home х A openvellum.ecollege.com/course.html?courseld=15778750&HepID=...
A: Using the Gauss law,
Q: Does the speedometer in a car measure velocity, speed, or both?
A: Speed of an object is defined as the distance travelled by an object per unit time. It is a scalar q...
Q: What is the force due to oil acting on a circular plate 5cm in diameter which covers a hole in botto...
A: Step 1It is given, the diameter of circular plate, height of the hole and relative density of oil ar...
Q: A truck travelsdue East for a distance of 1.1km, turns around and goes due west for 6km, and finally...
A: Move towards east = 1.1 km.Turn around and move towards west = 6 kmTurn around and move towards east...
Q: You are lowering two boxes, one on top of the other, down the ramp shown in the figure (Figure 1) by...
A: A)Angle of inclination is,
Q: Is it a cause of worry when your body temperature is 310K?
A: The average body temperature of human being ranges from 36.5°C to 37.5°C. Any temperature below 35°C...
Q: Obtain an expression for reaction of the discharged flow through an orifice in a vessel.
A: The outlet velocity of the discharged flow through an orifice in a vessel can be calculated as,
Q: What is reflection of light? Also expalin its types.
A: When a ray of light falls on any object (polished, smooth, shiny object), light from that object bou...
Q: A beachgoer in Florida notices the waves crashing ashore are spaced 15 meters apart and hit the shor...
A: The expression for the speed of the wave is,
Q: 5. (a) Calculate Earth's average speed relative to the Sun. (b) What is its average velocity over a ...
A:
Q: In the Funny Car competition at the local speedway dragrace, a driver completes the quarter-mile dra...
A: Given information:Distance travelled (d) = quarter mile = 1/4th of mile = 1609/4 m = 402.25 mTime ta...
Q: Grains of fine California beach sand are approximately spheres with an average radius of 70 μ m and ...
A: Volume V = 1 m3Mass m = 2600 kgDensity of silicon dioxide ρ = m / V= 2600 kg / m 3Radius of sane r =...
Q: 30. The volume of Earth is on the order of 10^21 m^3. (a) What is this in cubic kilometers (km^3)? (...
A: The given volume of the Earth is
Q: Suppose that the length of an object is measured multiple times. Assuming that random errors are th...
A: Error is defined as the uncertainty obtained occurs doing an experiment. The standard deviation is a...
Q: The opposite faces of a cubical block of iron of cross section 4cm2 are kept in contact with steam a...
A: The heat transfer equation is given by
Q: What is Luminance? Also give its formula.
A: The brightness of light radiation which appears to the human eye after its getting reflected from th...
Q: What is the wavelength of radio waves transmitted by a radio station with a frequency of 220 million...
A: Wavelength is,
Q: A coil with circular cross section and 24 turns is rotating at a rate of 430 rpm between the poles o...
A: a)The required radius is,
Q: Suppose you are hiking along a trail. Make a comparison between the magnitude of your displacement a...
A: The distance travelled is the total path covered by the object.The displacement is the shortest stra...
Q: A free electron is suspended in an electric field near the surface of the Earth. Give an expression ...
A: The formula for the electrostatic force on an electron in electric field and gravitational field is:
Q: Three balls (labeled A, B, C) are placed into two different boxes (1 and 2), as in (Figure 1). If al...
A: Total number of cases,
Q: Samir tests his new motorcycle by racing with Ahmad. Both start from rest, but Samirleaves the start...
A: Given:Initial velocity of both the persons = 0Acceleration of Ahmad = 4 m/s2Acceleration of Sameer =...
Q: Explain electromagnetic induction.
A: Electromagnetic induction: The phenomenon of producing induced e.m.f and hence induced current in a ...
Q: Calculate the maximum fractional frequency shift for an incident photon of wavelength ? =1 Å scatter...
A: From Compton effect, the expression for the frequency is:
Q: What is the temp of the gas at A & B? Also, how could I find other points on the diagram that wo...
A:
Q: What kind of thermal conductivity and specific heat requirements would you specify for cooking utens...
A: For cooking utensils, it should have low specific heat. So it can easily attain the temperature of t...
Q: What does tea in thermos flask (Dewar flask) remain hot for long time?
A: A thermal or Dewar flask is a storage vessel that provides insulation to its contents from the surro...
Q: Why is sawdust a poorer conductor than wood from which it is made?
A: Step 1Sawdust is the powdered form of wood.
Q: What is a heat engine?
A: In order to convert heat into work , heat engine is the device used for this conversion. The working...
Q: In the configuration of charges shown in the figure above, a=3.85a=3.85 cm. What is the magnitude of...
A: Given,
Q: There are two charges q1 = 10 μC and q2 = 70 μC placed 0.5 m apart and fixed in place. q1 is on the ...
A: Draw the following diagram representing the system of charges.
Q: A 30 kg of balloon is filled with 100m3 of hydrogen. How much force is needed to hold it down? Densi...
A: Given information:Density of the air (ρair) = 1.293 kg/m3Density of hydrogen (ρhyg) = 0.09 kg/m3The ...
Q: Field testing has revealed the following information:1) The tank moves from rest to a speed of 50 ??...
A: Part a:Given information:
Q: What is the largest average velocity of blood flow in an artery of radius 2*10 raise to power -3 m i...
A: Radius of artery = 2×10-3 m.Type of flow = Laminar.
Q: What are Maxwell's relation? Give its derivation.
A: in order to relate variations in one set of thermodynamic variable to other set of variables, Maxwel...
Q: Lead has a density of 11.3 g/cm^3. What is the volume in cubic centimeters of 1 kg of lead
A: Write the expression for volume
Q: Why can water be boiled in paper cup?
A: Step 1Water can be boiled in paper cup without burning the paper cup.
Q: If a number of little droplets of water of surface tension T , all of the same radius r, cobmine to ...
A: Given:Little water droplet have surface tension T and radius ‘r’.Radius of the bigger drop = R
Q: A person walks first at a constant speed of 5.50 m/s along a straight line from point A to point B a...
A: Let the distance from A to B is d.Write the expression to find the time taken in both trips.
Q: The blood pressure in humans is greater at the feet than at the brain.
A: The expression for the pressure in a liquid is
Q: Thermal conductivity of air is less than that of felt but felt is a better heat insulator in compari...
A: The thermal conductivity of air is less than the felt whereas the open air conducts heat through con...
Q: Ken Runfast is the star of the cross-country team. During a recent morning run, Ken averaged a speed...
A:
Q: Describe one difference between a rubber band and a spring as a mechanism for storing elastic potent...
A: Step 1The rubber band is deformed much more than the spring. The spring is present as a helical stru...
Q: The rms (root-mean-square) speed of a diatomic hydrogen molecule at 50∘C∘C is 2000 m/sm/s. Note that...
A: Write the expression for the kinetic energy of gases in terms of temperature.
Q: What are AC generators and transformers?
A: AC generators: AC generators are also known as alternators which converts mechanical energy into ele...
Q: On removing the valve, the air escaping from cycle tube becomes cool. Explain.
A: The first law of thermodynamics states that,
Q: Question 2
A:
Q: A toy car having mass m = 1.25 kg collides inelastically with a toy train of mass M = 3.65 kg. Befor...
A: (a)From the conservation of momentum of the car and train system,Substitute the values,
Sometimes a cycle with well inflated tyre left in the Sun has its tube burst open. Why?
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- Why is it easier to start a fire with kindling rather than with large sticks and logs of the same kind of wood?Does a car burn more gasoline when its lights are turned on? Does the overall consumption of gasoline depend on whether or not the engine is running while the lights are on? Defend your answer.Can someone help me with this question And is the Work done on or by the gas?
- Every so often, someone claims to have built a machine that can generate energy perpetually from nothing. Why isn't this possible according to the known laws of nature? Why do you think claims of perpetual motion machines sometimes receive substantial media attention?At typical nuclear power plants, refueling occurs every 17 months. Assuming that a plant has operated continuously since the last refueling and produces 1.6 GW of electrical power at an efficiency of 25%, how much less massive are the fuel rods at the end of the 17 months than at the start? (Assume 30-day months.)A car does 17000 km/year. One litre of fuel has mass 0.84 kg. Due to inertia when starting, kinetic energy required to reach a fixed speed and rolling resistance, all increasing with increased mass, 0.4 L /100 km of exrta fuel are used for every extra 100 kg of mass. If the fuel is 86% carbon, and this is entirely oxidised to form CO2 during combustion, how much extra CO2 is emitted per year if the car is driven with an average of 35 L of fuel rather than an average of 15 L? Atomic masses of C and O are 12 and 16 respectively.