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Physics
Page 39
Questions (147,130)
What observation led scientists to postulate the existence of photons?
A) electrons in atoms emitting energy only in certain
4 answers
asked by
Help me pls FAST
857 views
The time needed for a water wave to change from the equilibrium level to the crest is 0.20 s.
(a) What fraction of a wavelength
3 answers
asked by
homie
542 views
If I made an electromagnet what would the variables be. controlled, dependent and independent
3 answers
asked by
Mia
823 views
A scuba diver must decompress after a deep dive to allow excess nitrogen to exit safely from his bloodstream. The length of time
4 answers
asked by
phillip
616 views
A 4.5 cm tall object is placed 20 cm in front of a spherical mirror. It is desired to produce a virtual image that is upright
3 answers
asked by
Tom
3,783 views
soo for physics, we did a lab where we launched a cart on a track on the floor and recorded time, distance, etc. to figure out
4 answers
asked by
student
1,817 views
Two bumper cars collide. Both cars stop. How do you know that a force has acted on both cars?
did the cars change velocity? (yes,
4 answers
asked by
Nick
1,637 views
What is the best description of thermal energy?(1 point)
Responses Thermal energy is kinetic energy. Thermal energy is kinetic
3 answers
asked by
no name
326 views
Describe an experiment to show that the saturation vapour pressure of water at its boiling is equal to the air pressure on its
4 answers
asked by
Stella
293 views
A metal weighs 20N in air and 12N in water,calculate the relative density of the metal
4 answers
asked by
Anonymous
401 views
Distinguish between real and apparent cubic expansivity of a liquid.A glass bottle full of Mercury has mass 500g an being heated
4 answers
asked by
Mamshep Joseph Ponmwa
1,772 views
a woman stands at the center of a platform. the woman and the platform rotate with an angular speed of 5.00 rad/s. friction is
3 answers
asked by
Remie
1,430 views
A 30 N crate is submerged in water. The amount of buoyant force acting on the crate is 25 N. What will the crate do?
The crate
5 answers
asked by
dianni
2,485 views
what would happen to the number of rotations if the circumference of the tire were increased by 20%
what would happen to the
4 answers
asked by
Stacy B.
1,171 views
Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child
3 answers
asked by
stephanie
1,614 views
When “superballs” sprang upon the scene in the 1960’s, kids across the United States were amazed that these hard rubber
4 answers
asked by
Clark
1,033 views
An insulated beaker contains 300g of water initially at 30 degree celsius. water at 100 degree celsius is added until the
4 answers
asked by
annie
2,700 views
identify three devices that convert electrical energy into light, and give an advantage and disadvantage of each one.
3 answers
asked by
Scout
1,216 views
You need to siphon water from a clogged sink. The sink has an area of 0.36 and is filled to a height of 4.0 . Your siphon tube
3 answers
asked by
kelsi
4,602 views
Physics A Semester Online Practice
1. A wall measures 4.20 m ± 0.01 m by 3.10 m ± 0.02 m. What is the approximate percent
2 answers
asked by
Anonymous
403 views
A softball player tosses a ball into the air with an initial velocity of 11.0 m/s, as shown in the diagram. What will be the
3 answers
asked by
hind mohammed
613 views
Which circuit will have the greatest electric current
4 answers
asked by
Larry
1,779 views
What is the specific heat of lead if 13.6 cal are needed to raise the temperature of 35.6 g Pb by 12.5 LaTeX: ^\circ∘ C ? Your
4 answers
asked by
???
821 views
A uniform road AB of mass 6g is balanced horizontal about a knife edge at a distance of 3cm from end A where a mass of 8g is
4 answers
asked by
fadhili
773 views
A train travelling at 20m/s undergoes a uniform retardation of 2m/s(square) when brakes are applied calculate the time taken to
4 answers
asked by
johnlarryojukokobishop
1,922 views
A ball is thrown straight up from the top of a building 148 ft. tall with an initial velocity of 72 ft per second. The distance
s
3 answers
asked by
Reagan
1,461 views
Please do an e.g for me by Calculate the force required to move a small piston that has an area of 2m,if the force of a large
4 answers
asked by
Clendar
1,052 views
A fast-moving superhero in a comic book runs around a circular, 70-m-diameter track five and a half times (ending up directly
4 answers
asked by
Leanna
3,287 views
how do i draw a simple particle diagram to show how ear defenders will work
13 answers
asked by
fred
2,111 views
In the figure, forces A, B, C and D each have magnitude 50.0 N and act at the same point on the object. What torque (magnitude
3 answers
asked by
Erin
950 views
An object weighting 300 N is suspended by means of two cords. (There is a cord on the ceiling with is at 45 degrees. The second
3 answers
asked by
me
1,655 views
An object with a mass of 0.75 kg is projected over a horizontal surface with a speed of 2.5 m/s. It then comes to rest after 3.0
3 answers
asked by
Stefan
155 views
A Motorcycle Jump. You are planning to make a jump with your motorcycle by driving over a ramp that will launch you at an angle
1 answer
asked by
Joe
256 views
. An object has an excess charge of −8, 6 × 10−18 C. How many excess
electrons does it have?
4 answers
asked by
Isabella
994 views
You have several 36 ohm resistors and a 12 Volt battery.
d. When you connect one resistor to the battery, what is the current of
4 answers
asked by
hellp
1,097 views
A solenoid 10 turns per cm carries a current of 5A flowing through it. What is the magnetic field inside the solenoid?
5 answers
asked by
Raven
2,420 views
The efficiency to machine is 75% , if this machine raises a load of 150kg , through a vertical height of 20m,calculate the
4 answers
asked by
Olutunde
754 views
An electric motor is used to lift a load of bricks through a vertical height of 20m.the tension in the cable attached to the
3 answers
asked by
Wendy
744 views
Calculate the time it takes for a gamma ray to travel from the Sun to the Earth
Distance (mean) Earth to Sun=1.5 e11 m
3 answers
asked by
ted
1,034 views
A body rises vertically from the earth according to the law s = 64t – 16t2. If it has lost k times its velocity in its 48 ft
4 answers
asked by
Mithun
538 views
In the record setting race, a dragster reached a velocity of 145.08 m/s in 4.48s. What was the dragsters average acceleration?
4 answers
asked by
Mileena
1,087 views
The acceleration of a particle is defined by the relation a = -k/x . It has been experimentally determined that v = 15 ft/s when
3 answers
asked by
ccny
2,220 views
A car is moving along a straight road. The graph below shows how the speed
varies with time. "'0 W WCl. (/) time - Which of the
3 answers
asked by
Collins
1,476 views
1. At which position will the bar magnets most likely experience the least magnetic potential energy between them?
D - position 4
46 answers
asked by
ImLegit
17,490 views
Vectors, Magnitude, and Direction of Force Quick Check
3 of 53 of 5 Items Question The steepness of a line segment on a distance
3 answers
asked by
.
110 views
The resistance of a coil copper wire at 20 degree celsius is 2.21 ohms. After a current of 10 amperes has been flowing in wire
3 answers
asked by
jun
1,361 views
A ball is dropped a high cliff, and two second later another ball was thrown vertically downwards with an initial speed of 30
4 answers
asked by
Anonymous
2,857 views
A cardiologist uses an ultrasound scanner with an operating frequency of 3.5 MHz that can detect Doppler frequency shifts as
4 answers
asked by
Sarah
937 views
The Alert Hiker: An alert hiker sees a boulder fall from the top of a distant cliff and notes that it takes 1.3s for the boulder
3 answers
asked by
Zalak
3,409 views
A positive charge Q is on the y-axis at a distance a from the origin, and another positive charge q is on the x-axis at a
2 answers
asked by
Patrick
1,270 views
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