Question

3. The sound intensity from a jack hammer is 2.5W/m2 at a distance of 2.0m from the point of
operation. (a) how many dB is this? (b) what is the sound intensity at a distance of 50m? (c) how far
away must a person be for the dB level to be 50dB?

 

Expert Answer

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Science
Physics

Heat Transfer

Centre of Mass and Centre of Gravity

Work,Power and Energy

Radiation

Angular Motion

Semiconductor Devices

Rotational Mechanics

Fluid Mechanics

Magnetism

Wave Optics

Collisions

Semiconductors

Work,Power and Energy

Units and Dimensions

Dispersion and Spectra

Wave Motion

Vibrations

Electromagnetic Induction

Electrostatic Potential and Capacitance

Friction

Electromagnetic Waves

Magnetic Effects of Current

Kinematics

The Nucleus

Other

Alternating Current

Ray Optics

Kinetic Theory of Gases

Gravitation

Physics of Atoms

Current Electricity

Electric Charges and Fields

Newtons Laws of Motion

Vectors and Scalars

Thermodynamics

Mechanical Properties of Matter

Photometry

Related Physics Q&A

Find answers to questions asked by students like you.

Q: Consider the wave function phi(x) = A sin(kx) where k = 2pi/lambda and A is a real constant. (a) Wha...

A: Click to see the answer

Q: If a car takes a banked curve at less than the ideal speed, friction is needed to keep it from slidi...

A: Solution: given that radius r = 80 m theta = 15 degree v2 = 30 km /h=8.33 m/s

Q: A large water main is 2.50 m in diameter and the average water velocity is 6.00 m/s. Find the Hall v...

A: Given: Diameter of water main = 2.5 m. Average water velocity v = 6 m/s. Magnetic field of earth B =...

Q: 1. Draw a situation where a force is doing zero work. Explain why the force is doing no work, includ...

A: To explain a situation where work done by a force is zero.

Q: A proton in a large accelerator has a kinetic energy of 175 GeV. (a) Compare this kinetic energy to ...

A: Click to see the answer

Q: 1. In the Fahrenheit scale, the difference between the and lower fixed points is upper -degrees. 2. ...

A: Click to see the answer

Q: In the figure, block 1 has mass m1 = 460 g, block 2 has mass m2 = 520 g, and the pulley is on a fric...

A: (given) Mass (m1) of block 1 = 460 g = 0.46 kg Mass (m2) of block 2 = 520 g = 0.52 kg Radius (R) = 5...

Q: The string at the right is 6.0 meters long and is vibrating as the third harmonic. The string vibrat...

A: Length = 6 m number of vibrations in 10 seconds = 45Number of vibrations in 1 second = 4.5 Therefore...

Q: A basketball of mass 0.6kg is dropped from rest. Just before striking the floor, it has a momentum w...

A: Given data: Mass of basketball is, m=0.6 kg. Momentum is, P=3.1 kg·m/s.  

Q: (a) What is the efficiency of an out-of-condition professor who does 2.30 ✕ 105 J of useful work whi...

A: Click to see the answer

Q: A child places a picnic basket on the outer rim of a merry-goroundthat has a radius of 4.6 m and rev...

A: (a) The speed of the point on the rim is given by, v=2πrT Here, r is the radius of the merry-go-roun...

Q: A helicopter lifts a 100kg crate straight up via cable, with an acceleration of 0.8m/s2. If the crat...

A: Given data: The acceleration is a=0.8 m/s2, The mass of the crate is m=100 kg, The total lifted dis...

Q: A large wrecking ball is held in place by two light steel cables. If the massm of the wrecking ball ...

A: Click to see the answer

Q: Object A and B have identical size and shape, but Object A has a much higher density. The two object...

A: Buoyant force is upward force on the object by the fluid in which it is submerged. Fbuoyancy=VdgV is...

Q: An electron has a momentum with magnitude four times the magnitude of its classical momentum. (a) Fi...

A: Given:-                 An electron has a momentum with magnitude four times the magnitude of its cl...

Q: An oxygen tank contains 96.0 g of oxygen that has 6.00 atm of pressure at 77.0 °F. After some of the...

A: The initial pressure P1=6 atm=61.013×105 Pa=6.1×105Pa  The initial temperature T1=77.0°F=298.15 K Th...

Q: Calculate the effective resistance of a pocket calculator that has a 1.35-V battery and through whic...

A: Given quantities: potential difference  (V) = 1.35 V current flowing (i) = 0.2 mA   Let, the effecti...

Q: The neutron has a mass of 1.67 ✕ 10−27 kg. Consider a neutron moving with a speed of 0.960c. (Enter ...

A: Given: rest mass of neutron mo= 1.67 *10-27 kg speed v=0.960 c

Q: A car of mass 1,323 kg accelerates from rest to 21.8 m/s in 5.31 s. How much force was required to d...

A: From Newton's 2nd law of motion, we know that, if an object has mass m and acceleration a then the f...

Q: The lowest frequency in the FM radio band is 88.0 MHz. (a) What inductance is needed to produce this...

A: Click to see the answer

Q: An iceboat is at rest on a frictionless frozen lake when a suddenwind exerts a constant force of 200...

A: The work done on the boat by the wind force can be given by W=F→d→cosθ

Q: A basketball player jumps from a distance of 6m as shown in the figure and throws the ball as a bask...

A: Given data: Jumping distance is, x=6 m. Angle of projection is, θ=60∘

Q: Need help on parts c and d.

A: Click to see the answer

Q: An arctic weather balloon is filled with 1.56L of helium gas inside a prep shed. The temperature ins...

A: Given:Volume,V1=1.56LTemperature,T1=11°C=284KTemperature,T2=2°C=275 KFind , Volume,V2=..Now,From Cha...

Q: i only need answer...please help..in advance thank u

A: In the question, it is mentioned that we need the answer only. The answers are given below.

Q: T3 12.) A 2kg rock is moving at a speed of 6m/s. What is the magnitude of the force needed to stop t...

A: Given, A 2kg rock is moving at a speed of 6m/swe are asked to the magnitude of the force needed to s...

Q: A lightbulb is rated at 75 W when connected to 120 V. (a) What current flows through the bulb in thi...

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and s...

Q: A stuntman whose mass is 70 kg swings from the end of a 4.0-m-long rope along the arc of a vertical ...

A: Given data: Mass (m) = 70 kg. Length of the rope (L) = 4.0 m (a) At the binging of the motion, the t...

Q: A transverse wave is traveling on a string. The displacement y of a particle from its equilibrium po...

A: Given data: A transverse wave is traveling on a string. The displacement y of a particle from its eq...

Q: T3 5.) If an object has constant velocity, then there are no forces acting on it. A.) True B.) F...

A: The given statement is false. There might be a force acting on an object and still can have constant...

Q: A traffic light weighing 122 N hangs from a cable tied to two other cablesfastened to a support. The...

A: Click to see the answer

Q: R=76 A hall has a volume of 5600 m3 and reverberation time of 1.28 sec. If (290 + R) cushioned chair...

A: Click to see the answer

Q: Consider a person standing on a scale in an elevator. If the elevator accelerates upwards with an ac...

A: Mass of the person is m = 98.1 kg Acceleration due to gravity is g = 9.8 m/s2 and it acts in the dow...

Q: We are often advised to not flick electric switches with wet hands, dry your hand first. We are also...

A: The basic funda for this is that water is a conductor. The water that we use in our day to day lives...

Q: A small plane is preparing to land at an airport. It is at an elevation of 3,300 feet and descends a...

A: Click to see the answer

Q: The typical pressure of carbon dioxide in an unopened soda can is 350. kPa. Calculate the typical pr...

A: Click to see the answer

Q: (a) What is the characteristic time constant of a 25.0 mH inductor that has a resistance of 4.00 Ω? ...

A: Given, Inductance, L=25 mH=25x10-3 H, and resistance, R=4.00 Ω.

Q: Railroad tracks are made from segments L = 65 m long at T = 20° C. When the tracks are laid, the eng...

A: Given data:L= 65 m (each segment)T=20°Cα=12×10-6 °C-1TC=39.5°C 

Q: The vapor pressure of ethanol at 25°C is 0.07726 atm. Calculate the vapor pressure in kPa.Round answ...

A: The relationship between the atmosphere of pressure and Pascal is given as, 1 atm=101325 Pa Converti...

Q: When a certain ball is dropped from a height h,.it rebounds to height 0.4h. If this ball is droppedf...

A: Original height = 10 ft  = 120 inch New height after rebound = 0.4 H Final height = less than 6 inch...

Q: The duration of a photographic flash is related to an Rc time constant, which is 0.100 µs for a cert...

A: Given data: Time constant, τ = 0.1 μs = 1×10-7 s Resistance of flash lamp is R = 0.0400 Ω The relati...

Q: Procopio is driving a car (m = 1000 kg) at v1 = 11.11 m/s when he stepped on the brakes. The car tra...

A: Given, Mass of car = 1000 kg initial speed = 11.11 m/s stopping distance = 15 m

Q: (1%) Problem 16: A submarine is stranded on the bottom of the ocean with its hatch 25 m below the su...

A: Pressure on outside of the hatch of the submarine at 25 m below the surface of sea will be, Po=1.01×...

Q: T3 3.) If an object suddenly explodes into two pieces, which of the following is true? (Choose all t...

A: Click to see the answer

Q: An 8.00 kg point mass and a 12.0 kg point mass are held in place 50.0 cm apart. A particle of mass m...

A: The formula for the gravitational force is: