1,302 Answered Questions for the topic physical science

Physical Science

03/02/21

Light is incident on a plane mirror at an angle of 46° relative to the normal. What is the angle of reflection? °
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Physical Science

02/26/21

A loud speaker has an input of 73 dB. If the volume of the sound is turned up so that the output intensity is 10000 times greater, what is the new sound intensity level? dB
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Physical Science

02/26/21

During a thunderstorm, 5.9 s elapses between observing a lightning flash and hearing the resulting thunder.

Approximately how far away in kilometers and miles was the lightning flash? (Assume the speed of sound is 344 m/s.) km mi
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Physical Science

02/26/21

Compute the wavelength in air of ultrasound with a frequency of 48 kHz if the speed of sound is 344 m/s. m
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Physical Science

02/26/21

Compute the wavelength of the radio waves from the following stations. (a) an AM station operating at a frequency of 800 kHz m
(b) an FM station with a frequency of 98.9 MHz m
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Physical Science

02/26/21

A sound wave has a frequency of 2014 Hz. What is the distance between crests or compressions of the wave? (Take the speed of sound to be 344 m/s.) m
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Physical Science

02/26/21

Waves moving on a lake have a speed of 2.8 m/s and a distance of 1.1 m between adjacent crests. (a) What is the frequency of the waves? Hz
(b) Find the period of the wave motion. s
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Physical Science

02/26/21

1. A periodic wave has a frequency of 5.1 Hz. What is the wave period? s
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Physical Science

02/26/21

What is the weight in newtons of a 202 g package of breakfast cereal? N
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Physical Science

02/26/21

A person running a fever has a temperature of 38.6°C. What is this temperature on the Fahrenheit scale? °F
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Physical Science Science Physics

02/26/21

Sue travels 10 miles north, 3 miles east, 7 miles south, 2 miles west, 1 mile north, 1 mile west, and 4 miles south. a. Draw the motion. b. What is her displacement? c. What is her distance?
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Physical Science

02/25/21

How much work is required to lift a 2.9-kg concrete block to a height of 2.0 m? J
Another QuestionA person running a fever has a temperature of 38.6°C. What is this temperature on the Fahrenheit scale? °F
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Physical Science

02/25/21

A constant net force of 1325 N gives a toy rocket an acceleration of 2.8 m/s2. What is the mass of the rocket? kg
Another question What is the weight in newtons of a 202 g package of breakfast cereal? N
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Physical Science

02/25/21

Joe Cool drives to see his girlfriend who attends another college. (a) The 160. km trip takes 2.0 h. What was the average speed for the trip? km/h
(b) The return trip over the same route takes 3.0 h because of heavy traffic. What is the average speed for the return trip? km/h(c) What is the average speed for the entire trip? km/h
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Physical Science

02/24/21

how much work must be done on a 1,000-kg car to increase its speed from 1 m/s to 2 m/s?
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Physical Science

02/15/21

A worker pushes horizontally on a large crate with a force of 120 N, and the crate is moved 3.2 m. How much work was done? J
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Physical Science

02/15/21

While rearranging a dorm room, a student does 334 J of work in moving a desk 2.1 m. What was the magnitude of the applied horizontal force? N
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Physical Science

02/15/21

(a) What is the kinetic energy in joules of a 960-kg automobile traveling at 70 km/h? J (b) How much work would have to be done to bring a 960-kg automobile traveling at 70 km/h to a stop? J
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Physical Science

02/15/21

What is the potential energy of a 3.15-kg object at the bottom of a well 11.8 m deep as measured from ground level? J Explain the sign of the answer.
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Physical Science

02/15/21

A student who weighs 571 N climbs a stairway (vertical height of 3.1 m) in 30 s. (a) How much work is done? J (b) What is the power output of the student? W
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Physical Science

02/15/21

A microwave oven has a power requirement of 1,245 W. A frozen dinner requires 4.8 min to heat on full power. (a) How much electrical energy (in kWh) is used? kWh
This is the second part of the question. (b) If the cost of electricity is 10¢ per kWh, how much does it cost to heat the dinner? (Do not round your final answer. Fractional cent values are... more
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Physical Science

02/12/21

What is the velocity of a quarter dropped from a tower after 10 seconds?
use the formula Vf - Vl divided by fShow your work
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Physical Science

02/06/21

What is the period of a wave that has a frequency of 300 Hz
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Physical Science

02/05/21

Does 40kg mass and 40N weight have the same mass?
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Physical Science

01/30/21

Modified True or False: the process depends on the fact that living things contain a known amount of radioactive 14C, which has a half - life of 7730 years.
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