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- A man blows into one end of a U-tube containing water until the levels differ by 40.0 cm. if the atmospheric pressure is 1.01 ×...(Solved)
A man blows into one end of a U-tube containing water until the levels differ by 40.0 cm. if the atmospheric pressure is 1.01 × 105 N/m2 and the density of water is 1000 kg/m3, calculate his lung pressure.
Date posted: October 9, 2018. Answers (1)
- The height of the mercury column in a barometer is found to be 67.0 cm at a certain place. What would be the height of...(Solved)
The height of the mercury column in a barometer is found to be 67.0 cm at a certain place. What would be the height of a water barometer at the same place? (Densities of mercury and water are 1.36 × 104 kg/m3 and 1.0 × 103 kg/m3 respectively.)
Date posted: October 9, 2018. Answers (1)
- A diver is 10 m below the surface of water in a dam. If the density of water is 1,000 kgm-3, determine the pressure due...(Solved)
A diver is 10 m below the surface of water in a dam. If the density of water is 1,000 kgm-3, determine the pressure due to the water on the diver. (Take g = 10 Nkg )
Date posted: October 9, 2018. Answers (1)
- A rectangular brick of weight 10 N, measures 50 cm × 30 cm × 10 cm. calculate the values of the maximum and minimum pressures...(Solved)
A rectangular brick of weight 10 N, measures 50 cm × 30 cm × 10 cm. calculate the values of the maximum and minimum pressures which the block exert when resting on a horizontal table.
Date posted: October 9, 2018. Answers (1)
- The length of a spring is 16.0 cm. its length becomes 20.0 cm when supporting a weight of 5.0 N. calculate the length of the...(Solved)
The length of a spring is 16.0 cm. its length becomes 20.0 cm when supporting a weight of 5.0 N. calculate the length of the spring when supporting a weight of: (a) 2.5 N (b) 6.0 N (c) 200 N
Date posted: October 9, 2018. Answers (1)
- Outline the types of forces(Solved)
Outline the types of forces
Date posted: October 9, 2018. Answers (1)
- State three properties of gamma rays which differ from that of alpha and beta particles(Solved)
State three properties of gamma rays which differ from that of alpha and beta particles.
Date posted: September 20, 2018. Answers (1)
- The speed of sound in air is 340 m/s.A loudspeaker placed between two walls X and Y, but nearer to wall x than wall y,...(Solved)
The speed of sound in air is 340 m/s.A loudspeaker placed between two walls X and Y, but nearer to wall x than wall y, is sending out constant sound pulses.How far is the speaker from wall Y if it is 200 m from wall X and the time between the two echoes received is 0.176 s.
Date posted: September 17, 2018. Answers (1)
- The ship sends out an ultrasound whose echo is received after 10s. If the wavelength of the ultrasound in water is 0.05 m and the...(Solved)
The ship sends out an ultrasound whose echo is received after 10s. If the wavelength of the ultrasound in water is 0.05m and the frequency of the transmitter is 50kHz, calculate the depth of the ocean
Date posted: September 17, 2018. Answers (1)
- A cog wheel rotating uniformly produces sound of wavelength 1.65 m. If it makes 10 revolutions/second, find the number of teeth on the wheel, given...(Solved)
A cog wheel rotating uniformly produces sound of wavelength 1.65 m. If it makes 10 revolutions/second, find the number of teeth on the wheel, given that the velocity of sound in air is 330 m/s.
Date posted: September 17, 2018. Answers (1)
- Two girls stand 200 m from a wall. One bangs two pieces of wood together while the second starts a stop watch and stops it...(Solved)
Two girls stand 200 m from a wall. One bangs two pieces of wood together while the second starts a stop watch and stops it when he hears the echo. If the time shown on the stop watch is 1.2 s, calculate the speed of sound.
Date posted: September 17, 2018. Answers (1)
- It is noted that 250 cm^3 of fluid flows out of a tube, whose inner diameter is 7 mm,in a time of 41 s. What...(Solved)
It is noted that 250 cm^3 of fluid flows out of a tube, whose inner diameter is 7 mm,in a time of 41 s. What is the average velocity of the fluid in the tube?
Date posted: September 17, 2018. Answers (1)
- A water wave travels 12 m in 4 s. If the frequency of the waves is 2 Hz, calculate the speed and the wavelength of...(Solved)
A water wave travels 12 m in 4 s. If the frequency of the waves is 2 Hz, calculate the speed and the wavelength of the wave.
Date posted: September 17, 2018. Answers (1)
- The length of a spring is 16cm. Its length becomes 20cm when supporting a weight of 5.0N.Calculate the length of the spring when supporting a...(Solved)
The length of a spring is 16cm. Its length becomes 20cm when supporting a weight of 5.0N.Calculate the length of the spring when supporting a weight of 200N and comment based on the answer.
Date posted: September 17, 2018. Answers (1)
- A metal cube suspended freely from the end of a spring causes it to stretch by 5 cm. A 500g mass suspended from the same...(Solved)
A metal cube suspended freely from the end of a spring causes it to stretch by 5 cm. A 500g mass suspended from the same spring stretches it by 2 cm. If the elastic limit is not exceeded, by what length will the spring stretch if a mass of 1.5 kg is attached to its end?
Date posted: September 17, 2018. Answers (1)
- Express each of the following numbers in standard form
a) 0.0000009047=
b) 201=
c) 0.087=
d) 2670=
(Solved)
Express each of the following numbers in standard form
a) 0.0000009047=
b) 201=
c) 0.087=
d) 2670=
Date posted: September 17, 2018. Answers (1)
- What will happen if you throw an empty glass jar with lid on and tight into a fire? Explain(Solved)
What will happen if you throw an empty glass jar with lid on and tight into a fire? Explain
Date posted: September 11, 2018. Answers (1)
- Why can't alternating current be used for recharging a battery?(Solved)
Why can't alternating current be used for recharging a battery?
Date posted: August 23, 2018. Answers (1)
- Explain the difference in the shape of the drops of mercury and water when placed on a clean glass surface(Solved)
Explain the difference in the shape of the drops of mercury and water when placed on a clean glass surface.
Date posted: August 21, 2018. Answers (1)
- The count rate of a radioactive indium falls from 3200 counts per minute to 200 counts per minutes in 220 minutes(Solved)
The count rate of a radioactive indium falls from 3200 counts per minute to 200 counts per minutes in 220 minutes. Determine the half-life of the radioactive isotope
Date posted: August 19, 2018. Answers (1)