Physics question and answers for September 27, 2023
- Q Why don't heat pumps work well in colder climates? Is the sametrue of refrigerators? Explain.
- Q Mercury (Hg) is a metal that melts at –39 oC, and thus is aliquid for temperatures where water is liquid.The latent heat of melting of mercury and specific heat ofliquid...
- Q Consider a pulsar, a collapsed star of high extremely highdensity with mass M equal to that of the Sun (2.0E30 kg), a radiusR=14000m, and a rotational period T=0.023sec. A 15500kg,...
- Q It’s your birthday, and to celebrate you’re going to make yourfirst bungee jump. You stand on a bridge 100 m above a raging riverand attach a 30-m-long bungee cord to...
- Q Multiple choice: The presence of a black hole in a galaxy corecan be inferred from (a) the total mass of the galaxy; (b) thespeeds of stars near the core; (c)...
- Q The water level in a vertical glass tube 1.00 m long can beadjusted to any position in the tube. A tuning fork vibrating at716 Hz is held just over the...
- Q A 2·g spider is dangling at the end of a silk thread. You canmake the spider bounce up and down on the thread by tapping lightlyon its feet with a...
- Q The figure shows a pendulum of length L = 2.6 m. Itsbob (which effectively has all the mass) has speedv0 when the cord makes an angleθ0 = 42° with the...
- Q A 0.30 kg puck, initially at rest on a frictionless horizontalsurface, is struck by a 0.20 kg puck that is initially moving alongthe x axis with a velocity of 2.4...
- Q A rescue plane flies horizontally at a constant speed searchingfor a disabled boat. When the plane is directly above the boat, theboat's crew blows a loud horn. By the time...
- Q 1. The angle of an airplane propeller makes with the horizontalas a function of time is given by θ=(125rad/s)t+(42.5rad/s^2)t^2.estimate the instantaneous angular velocity at t=0.00s bycalculating the average angular velocity...
- Q A uniform hoop (I = MR2), solid disk (I = 1/2 MR2), and solidsphere (I = 2/5 MR2), each with the same mass and radius, arerolling without slipping, at the...
- Q A fellow student with a mathematical bent tells you that thewave function of a traveling wave on a thin rope isy(x,t)=(2.30mm)cos[(6.18rad/m)x+(702rad/s)t]. Being more practical,you measure the rope to have a...
- Q Two loudspeakers emit sound waves along the x-axis. Alistener in front of both speakers hears a maximum sound intensitywhen speaker 2 is at the origin and speaker 1 is at...
- Q How many 65-W lightbulbs can be connected in parallel across apotential difference of 80 V before the total current in thecircuit exceeds 2.0 A ?
- Q Does the sign of the charge of an elementary particle, like anelectron or proton, is a more, or less, fundamental property thanthe \"sign\" of its symmetry?
- Q REMARKS The negative value of qindicates the image is virtual, or behind the mirror. The image isupright because M is positive.QUESTION Is the image that a convex mirrorproduces real or...
- Q 17.You launch a projectile at an initial speed of 45.8m/s from the ground. After 3.30 seconds of flight, the projectilelands on the ground. At what angle above the horizontal was...
- Q Is our society truly facing an \"energy crisis\", assuming by thisterm we mean that we are running out of energy? What is happeningto our energy resources as a result of...
- Q (a)When 117 J of energy is supplied as heat to 2.00 moles of an idealgas at constantpressure, the temperature rises by 2.00 K. Calculate the molar heatcapacity at constantpressure, CP,m...
- Q Inflation(a) Why is it puzzling that the observed CMB temperature isalmost exactly the same on opposite sides of the sky? How wouldthis result be explained in cosmology theories that do...
- Q A spring (k = 100 N/m), which can be stretched or compressed, isplaced on a frictionless table. A 5.00-kg mass is attached to oneend of the spring, and the other...
- Q Howwould the velocity of sound change on the moon?
- Q A viscous incompressible fluid is between two parallel plates(that are along the x-z plane), one of them is at y = 0 and theother at y = d.a) Considerthecasewheretheflowisstationaryinthezˆdirection,driven by...
- Q An open container holds ice of mass 0.560 kg at a temperature of-19.6 ∘C . The mass of the container can be ignored. Heat issupplied to the container at the...
- Q The evaporation of water cools the surroundings, and thecondensation of this vaporDoes nothingWarms the surroundingsIncreases the value of the latent heat of vaporizationDecreases the value of the latent heat of...
- Q The volume of an ideal gas is held constant. Determine the ratioP2/P1 of the final pressure to the initial pressure when thetemperature of the gas rises (a) from 51 to...
- Q Two streams merge to form a river. One stream has a width of 8.4m, depth of 3.5 m, and current speed of 2.1 m/s. The other streamis 6.4 m wide...
- Q In the figure, a solid cylinder of radius 16 cm and mass 7.7 kgstarts from rest and rolls without slipping a distance L =4.4 m down a roof that is...
- Q consider two cubes: a copper cube (Density = 8.96 g/cm^3) and alead cube (Density = 11.4 g/cm^3) that both have an edge length of3.0 cm.1) which cube (if either) has...
- Q I need the steps for this problem. If a runner (perpendiculararea = 0.6 m2; fluid density = 1.14 kg/m3; Cd = 0.5) completes amarathon (26.2 miles) in three hours, while...
- Q In the plumbing of an old house water enters a copper pipe of 1inch diameter and with a flow rate of 0.25 gal/s.A) After several bends the pipe reaches a...
- Q n = 4.67 mol of Hydrogen gas is initially at T = 345.0 Ktemperature and pi = 3.02×105 Pa pressure.The gas is then reversibly and isothermally compressed until itspressure reaches...
- Q You decide to roll a 0.15-kg ball across the floor so slowlythat it will have a small momentum and a large de Brogliewavelength. A.If you roll it at 1.2×10−3 m/s...
- Q (a) Explain what is a Gyroscopie ratio. (b) Using theGyroscopie ratio for 1H, Calculate the Lamor frequency for 21T NMRmagnet. (c) Why HTS magnet (insert magnet) is necessary to build...
- Q A hollow sphere of radius 0.190 m, with rotational inertiaI = 0.0218 kg·m2 about a line through itscenter of mass, rolls without slipping up a surface inclined at10.8° to the...
- Q 3.0moles of an ideal gas with a molar heat capacity at constant volumeof 4.9 cal/(mol·K) and a molar heat capacity at constant pressureof 6.9 cal/(mol·K) starts at 300 K and...
- Q Jupiter is at an average distance from the Sun of 778,000,000kilometers. It has a radius of 71,492 kilometers and a mass of1.898 x 1027 kilograms. The Sun has a mass...
- Q A 712 N student stands in the middle of a frozen pond having aradius of 5.9 m. He is unable to get to the other side because of alack of...
- Q with regards to the Frank-Hertz experiment, How would increasingthe temperature affect a graph of current vs accelerating voltage?Would there be a higher or lower background current? Sharper orless sharp peaks?instinctually...
- Q A gamma ray of exactly 1.022 MeV produces an e+ ande-. The e+ and e- have zeromomentum.a) What is the momentum of the gamma ray?b) Where does the momentum go...
- Q In our experiment we used a block with different materials onits sides. One side was wood, the other was felt, the last wascork. We then used attached a string to...
- Q (a) How is self-inductance defined and what physical principleallows us to define it ?(b) In discussing LRC circuits we found that comparison withsimple oscillating mechanical systems such as a mass...
- Q Marty and Jennifer's twin granddaughters, Emma and Clara, arepreternaturally talented at riding hoverboards. One fine day, theyoung twins, each riding her own hoverboard, are cruising acrossthe hoverpark arm-in-arm. The mass...
- Q A 60.0 kg skier is moving at 6.15 m/s on a frictionless,horizontal snow-covered plateau when she encounters a rough patch3.95 m long. The coefficient of kinetic friction between this patchand...
- Q For each situation below determine the direction of the inducedcurrent in the loop (if there is one).(a) A square loop is moving at a constant velocity to the rightthrough a...
- Q A steel ball of mass 0.770 kg is fastened to a cord that is38.0 cm long and fixed at the far end. The ball is then releasedwhen the cord is...
- Q A 300kg roller coaster at an amusement park is at rest on top ofa 30m hill (Point A). The car starts to roll down the hill andreaches point B, which...
- Q Use proper calculus. (a) A conical shell has mass M, height h,and base radius R, Assume it is made from thin sheet of uniformthickness, Derive its center of mass and...
- Q Anunstretched spring is 30 cm long. When the spring is stretched to atotal length of 60cm, it supports transverse waves moving at 4.5m/s. How fast will waves travel in this...
- Q A block with mass M1 rests on a frictionless table. It isconnected by a massless string to a block with mass M2, which hangsbelow the edge of the table. The...
- Q An ideal monatomic gas is contained in a vessel ofconstant volume 0.350 m3. The initialtemperature and pressure of the gas are 300 K and 5.00 atm,respectively. The goal of this...
- Q An artificial satellite of the Earth releases a bomb. Neglectingair resistance, the bomb will never strike EarthWhy never striking earth? can you explain deeply? why it willcontinue to orbit and...
- Q A system of point charges includes q1= +1 microC atx1= 2m, y1= 2m; q2= -1 micro C atx2= -3m, y2= -3m; q3= +3 microC atthe origin.a) What is the electrical...
- Q A placekicker is about to kick a field goal. The ball is 25.3 mfrom the goalpost. The ball is kicked with an initial velocity of20.8 m/s at an angle θ...
- Q An insulated Thermos contains 128 g of water at 81.3 ËšC. You putin a 12.5 g ice cube at 0.00 ËšC to form a system of ice +original water. The...
- Q championship swimmers take about 22 seconds and about 30 armstrokes to move through the water in a 50 meter freestyle race.A) A swimmers metabolic power is 800 W. if the...
- Q An object has a relativistic momentum that is 7.3 times greaterthan its classical momentum.What is its speed?Express your answer using two significant figures.v=__________c
- Q 12. Object 1 has twice the mass of Object 2. Object 2 has thesame momentum as Object 1. Which of the following is true? a. Oneobject has 0.707 times the...
- Q A worker pours 1.250kg of molten lead at a temperature of 327.3?C into 0.5050kg of water at a temperature of 75.00 ?C in aninsulated bucket of negligible mass.Assuming no heat...
- Q Draw one arrangement of a current induced in a coil with asecond coil and a battery. Include the way the galvanometer washooked up. Show the current direction and how the...
- Q The x and y coordinates of a particle in motion as functionsoftime t, are given by:x=5t^2-5t+6 y=3t^3-3t^2-12t-4At the instant the x-component of velocity is equal tozero,the y component of the...
- Q You have two ropes with different Young’s modulus, but the samearea of cross section and length. You apply the same force on bothof these. The change in the length is...
- Q Q1: Consider the simple pendulum system, the length of thependulum is ‘l’ and mass‘m’ has simple harmonic motion.Find the equation of motion using 2 approaches: Newtonian andLagrangian.What do you conclude?
- Q 1- A long jumper leaves the ground at an angle of 17.0
- Q You are in a helicopter towing a 127-kg laser detector that ismapping out the thickness of the Brunt Ice Shelf along the coast ofAntarctica. The original cable used to suspend...
- Q A steel ball is dropped from a building's roof and passes awindow, taking 0.131 s to fall from the top to the bottom of thewindow, a distance of 1.12 m....
- Q An empty tin can with height of 30cm and a diameter of 15cm isopen at one end and closed at the other end. If the vertical can,with open end down,...
- Q A sample has a activity of 0.0089 Bq per gram of carbon. (a)Find the age of the sample, assuming that the activity per gram ofcarbon in a living organism has...
- Q Anunstretched spring is 30 cm long. When the spring is stretched to atotal length of 60cm, it supports transverse waves moving at 4.5m/s. How fast will waves travel in this...
- Q The emissivity of the human skin is 97.0 percent. Use 35.0 °Cfor the skin temperature and approximate the human body by arectangular block with a height of 1.64 m, a...
- Q Problem 6.21A 5000kg truck is parked on a 12? slope.Part AHow big is the friction force on the truck? The coefficient ofstatic friction between the tires and the road is...
- Q An ideal gas undergoes an isothermal expansion from one stateto another.  In this process determine the following(using the sign conventions on page 413):Q = 0, Q > 0 or Q <...
- Q A 108 m long train starts from rest (at t = 0) and acceleratesuniformly. At the same time (at t = 0), a car moving with constantspeed in the same...
- Q An airplane propeller starts from rest and 2 seconds later itis rotating with an angular speed of 350 rev/min. If the angularacceleration is constant, calculate(a) its angular acceleration.(b)how many revolutions...
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