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Physics
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A radioactive substance has a half life of 60s.what fraction of the original substance would you expect to exist after 180s.
1 answer
asked by
Riliwan
437 views
A fixed mass of gas of volume 600 cm cube at a temperature of 27 C is cooled at constant pressure to a temperature of 0C.what is
2 answers
asked by
Rilwan
780 views
A chandelier of mass 120.0kg is supported by two cords. The first makes an angle of 60° with the ceiling and the second
4 answers
asked by
Elzeera-D
637 views
A uniform capillary tube closed at one end contained dry air trapped by a thread of mercury 8.5×10^-2m long.When the tube was
4 answers
asked by
Rilwan
1,058 views
Speed of the bus is 72 km per hour speed of the car is 15.5 meter per second which moves fast??
3 answers
asked by
SRIVIDYA
377 views
calculate the magnitude and direction of the resultant of two vectors 5N and 7N inclined at an angle 30° to each other
3 answers
asked by
Adedolapo
1,200 views
Types of thermometer
2 answers
asked by
Sharon
546 views
A stone is thrown vertically upward, after't'second it covers a distance of's' metre, where 's'=80t-16t2. It's velocity after 2
1 answer
asked by
Ratan
448 views
The frequency of a light wave is the same when the light travels in ethyl alcohol or in carbon disulfide.
Find the ratio of the
3 answers
asked by
Amy
1,664 views
A filmmaker wants to achieve an interesting visual effect by filming a scene through a converging lens with a focal length of
3 answers
asked by
AMY
638 views
two long, parallel lines each carry 100-A currents are 20 cm apart.
1) calculate the magnetic field at the point C that is 5 cm
1 answer
asked by
Michelle
404 views
What is viscosity
1 answer
asked by
Evans
419 views
A cart rolling down an incline for 5.0seconds has a beginning speed of 2.0m/s . What is the final speed?
1 answer
asked by
Nicole Tembo
387 views
an 11.5 kg object with a temperature of 25.0 degrees celsius is attached to a pulley mechanism. it is allowed to fall until is
1 answer
asked by
Anon
385 views
A transformer is to be used to provide power for a computer disk drive that needs 5.8 V (rms) instead of the 120 V (rms) from
4 answers
asked by
ricky
1,533 views
A bus moves from rest with a uniform acceleration of 2ms for d first 10s. If den accelerates at a uniform rate of 1ms for
2 answers
asked by
Omolade
662 views
A telescope has an objective with a refractive power of 1.65 diopters and an eyepiece with a refractive power of 240 diopters.
2 answers
asked by
Harry
776 views
A beam of singly ionized carbon atoms (C-12, C-13, and C-14 isotopes) is injected into a mass spectrometer, which isotopes would
2 answers
asked by
ricky
1,270 views
Why do seat belts reduce the likelihood of injury in an automobile accident? Why do airbags? Express your answers in terms of
3 answers
asked by
Morgan
654 views
A wire loop of radius 0.10m lies so that an external magnetic field of magnetic 0.50T is perpendicular to the loop. the field
2 answers
asked by
Maria
551 views
an unknown compound is known to contain 30.34%M and 60.56%O and has a molar mass of 92.00g. what are the empirical formula and
1 answer
asked by
Kenry
381 views
Using the expression of pressure(p) of a gas=1/3pc^-2.where p=density and c^-2=mean square velocity, derive the relation of the
3 answers
asked by
Evans
1,549 views
In what sense do the moon fall?
1 answer
asked by
Morgan
309 views
Weightlessness can be experienced in an airplane by having the plane descend just right. How does this work? Is this
1 answer
asked by
Morgan
467 views
A 10-kg crate is pulled along a horizontal floor by a constant force exerted by a person, Fp = 80N, which acts at a 45◦ angle.
4 answers
asked by
Laura
807 views
Find the electric potential at the centre of the square of side 1m at the four corners of charges of q1, q2,q3,and q4 are placed
6 answers
asked by
Ash
3,705 views
Pick a type of thermometer. How does it work? Suppose you used water in a thermometer instead of mercury, why might this be a
3 answers
asked by
Morgan
539 views
Why might wrapping a bottle in a wet cloth at a picnic cool the bottle faster than placing the bottle in a bucket of cold water?
2 answers
asked by
Morgan
487 views
The pressure in a water pigeon the ground floor of a building is4×10fifth pa but three floors up it is only 2×10fifth pa. What
2 answers
asked by
Miriam
518 views
A plane is circling the airport. It takes 35 min to do one circle with a radius of 5.0 x 10^4 m. The plane weighs 6.05 x 10^4
1 answer
asked by
Kai
388 views
When you freeze a metal pot, and ceramic mug, and take them out and get the bathroom steamy. What do you observe in terms of
2 answers
asked by
Morgan
576 views
Sapose active sonar on a stationary ship is used to determine the speed of a ship that is moving away from it. A sonar ping is
2 answers
asked by
Robert
509 views
An observer is located directly between two speakers, located 20m apart. The speakers are in phase with each other, and both are
2 answers
asked by
Robert
715 views
The velocity of sound in air is about 330m/s, and in water is about 1700m/s. Calculate the critical angle for sound leaving air
2 answers
asked by
Robert
628 views
17. Explain how water can transfer energy by conduction and by convection.
2 answers
asked by
Sarah
1,056 views
a 70 kg hockey player moving at 8.0m/s stops quickly. how much ice melts due to the friction between the player's skates and the
2 answers
asked by
Zaynah
1,315 views
In what ways are electric generators similar to electric motors? In what ways are they different? Is it possible to use the same
3 answers
asked by
Morgan
812 views
What precaution we should take while doing the experiment to understand the nature of friction
2 answers
asked by
Srija
469 views
Calculate the kinetic energy stored in a helicopter rotor consisting of four blades each 8m long and with a mass of 50kg if the
3 answers
asked by
Evans
460 views
An observer is located directly between two speakers located 20 metres apart.Speakers are in phase and both are emitting a sound
2 answers
asked by
Kelly
536 views
Suppose active sonar on a stationary ship is used to determine the speed of a ship that is moving away from it. A sonar ping is
2 answers
asked by
Kelly
585 views
Complete the sentence(only one word).As the water waves approach the shore they --------- into a medium of lower wave
1 answer
asked by
Kelly
393 views
calculate the timeperiod of simple period of length 0.84m when g =9.8ms-2
2 answers
asked by
Anonymous
1,024 views
Of the following materials, sound waves travel fastest through...?
Helium at room temperature Air at room temperature Water at
2 answers
asked by
Anon
868 views
A horizontal uniform bar of mass 2.6kg and length 3.0m is hung horizontally on two vertical strings. String 1 is attached to the
4 answers
asked by
ally
5,442 views
A converging lens forms a virtual image 2.61
times the size of the objecT. The object distance is 11cm. Find the distance of the
2 answers
asked by
Adam
568 views
Derive the coefficient of surface tension of mercury
2 answers
asked by
Evans
530 views
Please who can help me out.
Derive the coefficient of surface tension for water
1 answer
asked by
Evans
380 views
Someone please....
Derive the coefficient of surface tension for mercury
1 answer
asked by
Evans
325 views
Water ripples are caused to travel across the surface of a shallow tank by means of a suitable straight vibration.the distance
2 answers
asked by
Abolore
581 views
How would electrical current be affected if the time interval over which a charge passes through an area increases while the
1 answer
asked by
Anon
445 views
if water rises in a capillary tube 5.8cm above the free surface of the outer liquid. what will happen to the mercury level in
5 answers
asked by
Kenry
728 views
In a steady flow system crude oil of density 1200 kgm-3 flows at the rate of 275kg/min through a horizontal pipeline of varying
1 answer
asked by
Rooney
332 views
A rocket of mass,m is located at an alttitude h meters above the surface of a planet of a mass,M and radius, R.
*write an
2 answers
asked by
Bill
469 views
how could you tell if you had missed one of the natural frequencies when you were finding natural frequencies above the
1 answer
asked by
Zaynah
408 views
how could you tell if you had missed one of the natural frequencies when you were finding natural frequencies above the
1 answer
asked by
Anonymous
326 views
how could you tell if you had missed one of the natural frequencies when you were finding natural frequencies above the
1 answer
asked by
Anonymous
328 views
A ball thrown vertically upward from the ground level hits the ground after 4 seconds calculate the maximum height it reached
2 answers
asked by
Anonymous
558 views
If 0.022 kg of ice at 0C is added to 0.450 kg of water at 80C, what is the final temperature. (Assume that there is no heat lost
2 answers
asked by
Rilwan
640 views
A uniform beam of mass 2kg and length 4cm is rotated about an axis 8cm from one end.Determine it's moment of inertia
3 answers
asked by
Bill
647 views
The international space center is 1500km above the earth surface. Determine the escape velocity of a rocket launched into space
1 answer
asked by
Bill
471 views
A rotating turntable of mass 200g and
radius 10 cm is uniformly accelerated from rest to attain it's maximum velocity of 33 and
4 answers
asked by
Bill
454 views
The international space center is 1500km above the earths surface. Determine the escape velocity of a rocket launched into space
2 answers
asked by
Bill
532 views
"Provide calculations to show the force and pressure required to lift the weight of each draw bridge (or the load that is on the
2 answers
asked by
anonymous
520 views
a fixed mass of gas at constant pressure occupies a volume.the gas undergoes a rise in temperature so that the Vrms of its
2 answers
asked by
Bill
570 views
please I and my friend has been trying this one.
If there there are 2.7*10^19 molecules are there in 1.0cm3 of a gas at 273k and
3 answers
asked by
Bill
449 views
Determine the angular momentum of an object mass 25g been whirled round in a circular path of radius 20cm with a speed of of
1 answer
asked by
Kenro
401 views
Timmy the angry teen twirls dead rat mass is 2kg attached to the rusty chain length 1m in a vertical circle with what velocity
3 answers
asked by
Sakashi
1,597 views
A hunter wishes to cross a river that is 1.6 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a
2 answers
asked by
Kevin
479 views
A string 20cm long is stretched to 25cm by a load. What will be it's length when stretched by a load of 100N assuming that the
6 answers
asked by
Anonymous
637 views
The body mass is 0.4kg , its hung on a spring with stiffness of 90 N/m
What is the frequency of its oscillation?
2 answers
asked by
Naela
489 views
The body mass is 0.4kg , its hung on a spring with stiffness of 90 N/m
What is the frequency of its oscillation?
1 answer
asked by
Naela
362 views
The voltage across a lamp is (6.0 +_ 0.1) V and the current flowing through it is (4.0 +_ 0.2) A. Find the power consumed with
10 answers
asked by
Mimi
2,253 views
Two positive charge of 12cand 8c are 10cm apart each other. The work done in bringing them 4cm closer is
2 answers
asked by
Jai
658 views
A particle takes 7seconds to complete one revolution what will be it's angular speed
2 answers
asked by
Akash
529 views
An electron enters the region with u=3*10 6 m/s and E=200N/C. The horizontal length of the plate is 0.1m. Find
a. The wavelength
2 answers
asked by
Baruck
593 views
A gallon starts rising from the ground from rest with an upward acceleration 2m/s^2. Just after 1s, a stone is dropped from it.
1 answer
asked by
Mimi
450 views
Precaution for sliding friction and static friction?
2 answers
asked by
Madiha
747 views
Three charges q1= 2uc(0,0)cm q2=4uc(0,10)cm and q3=_3uc(15,0)cm acts on one another, find the magnitude of the total electric
2 answers
asked by
Gboss
1,162 views
the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0¡ãc. at what temperature will the length of the
2 answers
asked by
Jane
526 views
the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0 degree celsius at what temperature will the length of
3 answers
asked by
Jane
596 views
A uniform horizontal beam 300N 5m long is suspended vertical from its two end by a rope, if a 600N person stands in 1.5m from
3 answers
asked by
Mordu
1,261 views
If train travelling 72kmph is to be brought to rest distance of 200m then its retardation should be
5 answers
asked by
Anonymous
721 views
Three balls of mass m1,m2and m3 are lying in straight line. The first ball is moved with certain velocity so that is strikes the
2 answers
asked by
Thousif
535 views
A cyclist is stopped at a traffic light. When the light turns green, the cyclist accelerates at 3.2 m/s. After 2.4 seconds, what
4 answers
asked by
Amber
2,035 views
If you have swam one lap in a swimming pool, that means you have swam from one end to the other and back. In 2 h, a swimmer
3 answers
asked by
Cameron Lawrence
562 views
An element of P and atomic Q emits an alpha particle from its nucleus thet resultant numbers of the new element formed are
2 answers
asked by
Roseline
493 views
How much can be lifted using 2kg of effort using a jack screw with a 45cm handle and a 1/3 cm screw pitch?
Please show me the
3 answers
asked by
Logan
1,013 views
Hot air balloon A is rising upward at a rate of 10.0 m/s. A passenger aboard balloon A observes balloon B going down at a
2 answers
asked by
chase
1,070 views
The average distance between Earth and the Sun is 1.5 ✕ 10^11 m.
a) Calculate the average speed of Earth in its orbit (assumed
3 answers
asked by
Carl
2,879 views
A helicopter above the ground is descending at 3.5 m/s. It drops a package from rest(relative to the helicopter). Just before it
3 answers
asked by
Helga
2,682 views
4. In a shopping mall, two elevators pass each other moving in opposite directions. Each elevator to the other is 10 m/s. What
2 answers
asked by
Helga
994 views
A jetliner flies west 2,000 miles from Chicago you San Francisco. It has an average speed of 635 mph relative to the air. What
1 answer
asked by
Helga
1,012 views
A jetliner flies west 2,000 miles from Chicago you San Francisco. It has an average speed of 635 mph relative to the air. What
1 answer
asked by
Helga
676 views
During a typical afternoon thunderstorm in the summer, an area of 76.0 km2 receives 1.42 * 10^9 gal of rain in 18 min. How many
1 answer
asked by
Carl
712 views
A jetliner flies west 2,000 miles from Chicago you San Francisco. It has an average speed of 635 mph relative to the air. What
2 answers
asked by
Helga
2,614 views
Tectonic plates are large segments of the Earth's crust that move slowly. Suppose that one such plate has an average speed of
1 answer
asked by
Carl
1,153 views
Convert 92 feet/minute to meters/second
1 answer
asked by
Liberty
336 views
The average distance between Earth and the Sun is 1.5 ✕ 10^11 m.
(a)Calculate the average speed of Earth in its orbit (assumed
4 answers
asked by
George
4,495 views
A skydiver weighs 116 lb. When the skydiver reaches terminal speed, how much air drag does the skydiver experience?
4 answers
asked by
Cameron Lawrence
576 views
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