An object moving with a speed of 21 m/s and has a kinetic energy of 140 Joules, what is the mass of the object?

Q: A car covers a distance of 30 miles in 1/2 hour. What is its speed in miles per hour and in feet per…

A: v=dt=30 miles1/2 hour=60 miles/hr

Q: A 10 kg bowling ball rolls down the lane with speed of 7.8 m/s and hits a 0.9 kg pin. The pin rolls…

A: Given data:  Mass of ball (m1) = 10 kg Initial velocity of ball (u1) = 7.8 m/s Mass of pin (m2) =…

Q: The frequency of a wave is 50 Hertz and its wavelength is 25 meters. What is the velocity of this…

A: Introduction- Velocity of a wave is defined as the product of its frequency and Wavelength given-…

Q: What is the wavelength of a wave that has a frequency of 15 Hz and a speed of 2 m/s?

A: Given data:                  Frequency = 15 Hz                  Speed = 2 m/s Formula :…

Q: A large wine company owns 125-wine barrels that hold a capacity of 3,875 gallons each. How many…

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Q: What is the wavelength of a sound wave traveling through the air at sea level that has a frequency…

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Q: What is the speed of a wave that has a wavelength of 2 m and a frequency of 6 Hz?

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Q: What is the work done by a 300-watt electric grinder in 5 minutes?

A: Given value--- power = 300 W. time = 5 min. We have to find--- work done ?

Q: If a cheetah covers 150. yards in 50.0 seconds what would the speed be in miles per hour?

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Q: in four seconds a hawk can go from 10m/s to a 20m/s.how much Forst does it need to apply to reach…

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Q: A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What is its volume?

A: Answer: Given: density of the block ρ=5000Kgm3 Mass of block m= 15,000 Kg Find the volume of the…

Q: A bus travels 10 m in 2.5 seconds. What was the bus’s speed?

A: Speed of the bus can be calculated as,

Q: A 2 kg ball thrown with a velocity of 2 m/s carries a momentum of  ?

A: Momentum is,

Q: If a rock had a mass of 53kg and its total energy is 10,440 J, what amount of potential energy would…

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Q: How much does it cost to light a 300-W lightbulb for 30 days if the cost of electricity is 7¢/kWh?

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Q: A CAR LOADED DOWN WITH THREE FRIENDS AND ALL THEIR LUGGAGE GETS 23 MILES PER GALLON OF GAS. HOW MANY…

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Q: A tiny space inside a computer chip has been measured to be 2.56x10^-6 meters wide, 1.4x10^-7 meters…

A: Given: the dimension of the space in the computer chip is: width(b) =  2.56x10-6 m length(l) =…

Q: What velocity would a 5 kg ball need to have a KE=210?

A: Given: mass of the block, m = 5 kg Kinetic energy of the block, K.E = 210 J

Q: A 15 kg rifle fires a 100 gm bullet at 1,750 m/s. At what speed does the rifle kick back?

A: Using momentum conservation principle Initial momentum=Final momentum In this situation both rifle…

Q: A change in temperature of 50 degrees Celsius is equal to a change of?

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Q: How many electrons will weigh 1 mg if the mass of an electron is 9x10-28 g?

A: mass of an electron e=9.1×10-28g let number of electrons be n

Q: If the annual (8 hours per day) cost to run a 400-W computer is ₱12,000.00, how much does the…

A: Given data:  Daily uses = 8 hours per day Power (P) = 400 W = 0.400 kW Total cost of running…

Q: What is the frequency of a 3 meter wave that is moving at 1200 m/s?

A: Given data: Wavelength, λ=3 m Velocity, V=1200 m/s Our question is to find the frequency (f) of…

Q: A mass of 39g is placed on the end of a 4.1cm vertical spring. This causes the spring to extend to…

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Q: An object has kinetic energy of 324 J. If it's speed is 9 m/s, what is its mass in kilogram?

A: Given information: Here, KE is the object’s kinetic energy and v is the object’s speed.

Q: The speed of a wave is 47 m/s. If the wavelength of the wave is 0.5 meters, what is the frequency of…

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Q: What is the frequency of a wave with a speed of 10 m/s and wavelength of 20 m?

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Q: A car starts from rest and reaches a speed of 30 miles per hour in 8 seconds. What is its…

A: The expression for acceleration is a=v-ut

Q: A car is moving at a speed of 5 m/s in 4 s, he increases its speed to 15 m/s. What is acceleration ?

A: Introduction :  In this question we are provided it value of time taken , initial velocity and final…

Q: A vehicle is running with a velocity of 5m/s. If the momentum of the vehicle is 5000 kg m/s, what is…

A: Introduction :  In this question we are provided with value of velocity and momentum . With these…

Q: What is the mass of a bullet (in kg) that is moving with a velocity of 900 m/s and has a momentum of…

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Q: The driver of a car steps on the brakes, and the velocity drops from 35 m/s to 5 m/s in 4 seconds.…

A: Given:  initial velocity, u = 35 m/s  final velocity,v = 5 m/s  time, t = 4 s

Q: The spring in a scale is compressed by 1.62 cm when a mass of 500.00 g is placed on it. How much…

A: GIVEN Mass of the object = 500 gm compression in spring = 1.62 cm Mass of other object = 347 gm To…

Q: What is the momentum of an airplane that has a mass of 25,000 kg and is traveling at 40 m/s?

A: We have to calculate the momentum of an airplane that has a mass of 25,000 kg and is traveling at 40…

Q: A ray of light hits a mirror and bounces off. If the angle of incidence is 5.7. What is the angle of…

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Q: A wave traveling 85 m/s has a wavelength of 2.6 m. What is the frequency of the wave (in Hz)?

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Q: Price of onions at the store is $2.12/lb. What is the equivalent price per kg?

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Q: A candy bar contains 309 Food calories of energy. How much is this in J?

A: The relation between calories and Joule is: 1 calorie= 4.18 Joules

Q: A 4,500 Kg car going 15 m/s hits a 2,000 kg car going 20 m/s in a head-on collision and they stick…

A: Given- m1=4500 kgv1=15 m/sm2=2000 kgv2=20 m/s To find the new speed

Q: What is the frequency of a wave that has a speed of 10 m/s and a wavelength of 21 m?

A: The relation between speed of a wave , frequency and wavelength is given by v=fλ; where f is…

Q: A clothes washer used 3.2 kilowatt for 0.9 hour. If electricity costs $0.31 per kilowatt- hour, how…

A: Given data:  Power (P) = 3.2 kW Time (t) = 0.9 h Electricity cost = $0.31 /kWh Required: The total…

Q: What is the momentum of a car with mass of 1,300 km traveling north at a speed of 28 m/s?

A: Mass = 1300 kg Velocity= 28 m/s

Q: You run forward, pulling a sled behind you with a force of 250 N. If you expend 2,500 Joules, how…

A: Given data:  Force on sled (F) = 250 N Work done (W) = 2,500 J Displacement (d) =?

Q: Electricity travels at about the speed of light, 186,000 miles per second. How many meters it can…

A: 1 mile=1609.34 meters1 minute=60 seconds1 second=160 minutes

Q: What is the frequency of a wave that has a speed of 12 m/s and a wavelength of 15 m?  ____________

A: The expression for the frequency is,

Q: A car moves 105 meters within 5 seconds. What is its velocity over that period?

A: Given: The displacement if the car =105 meters. The time taken by the car to travel this distance =5…

Q: A hot water heater in a residential home runs for an average of 2.9 hours per day with a heat energy…

A: Given data:  Water heater used in a day = 2.9 hours per day Power (P) = 3.5 kW Cost of electricity =…

Q: The air in a room has a mass of 50 kg and a specific heat of 1,000 J/(kg.degrees celcius). What is…

A: Given,  Mass of air in the room =50 kg Specific heat of air =1000 J/(kg.degrees celcius) We have to…