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Physics
Page 40
Questions (147,385)
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
745 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
1,036 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
539 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
1,090 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
1,477 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
17,491 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
.
112 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
1,362 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
2,859 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
939 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
3,412 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
A boy drags a 100 N sled up a 20 degree slope at constant velocity. If the coefficient of friction between the sled and hill is
4 answers
asked by
amy
1,309 views
Two watermelons fall off a kitchen counter. The masses and speeds of the fruits are in the table. How do the kinetic and/or the
5 answers
asked anonymously
469 views
a 2 kg frictionless block is attached to an ideal spring with force constant 300N/m. At t=0, the spring is neither stretched or
3 answers
asked by
Anonymous
2,355 views
a 10-m uniform beam of weight 100N is supported by two ropes at the ends. If a 400N erson sits at 2.0 m from the left end of the
4 answers
asked by
lulu
4,774 views
An electron is moving through a magnetic field whose magnitude is 8.70*10^-4 T. The electron experiences only a magnetic force
4 answers
asked by
Kelly
1,234 views
To protect their crops during freezing temperatures, orage growers spray water onto the trees and allow it to freeze. In terms
4 answers
asked by
Judd
2,111 views
The weight in the following diagram has a mass of 0.50 kg and the cart has a mass of 0.26 kg. Friction is negligible. What is
3 answers
asked by
help
470 views
A 120-g chunk of 90 ∘C iron is dropped into a cavity in a very large block of ice at 0∘C. What is the mass of ice that
3 answers
asked by
Geovanni
1,388 views
A balloon filled with 3.5 L of helium at 20 °C and 3 atm. What will be the new pressure if its volume increases to 17.5 L at
3 answers
asked by
Anonymous
562 views
There are two pit balls equally charged and each with a mass of 1.5g. While one ball is suspended by a thread, the other is
3 answers
asked by
Connor
894 views
The potential at the surface of a sphere (radius R) is given by
V_0 = k cos 3theta where k is constant. Find the potential inside
3 answers
asked by
Kim
1,317 views
Atom Ant is traveling with an initial velocity of 20.0 cm/s. He begins to accelerate at a rate of 8.00 cm/s2 for 5.00 s. What is
3 answers
asked by
Anonymous
1,027 views
Steel Phantom is a roller coaster in Pennsylvania that, like the Desperado in Nevada, has a vertical drop of 68.6m Suppose a
3 answers
asked by
Anonymous
2,026 views
A 64-kg boy and a 42-kg girl use an elastic rope while engaged in a tug-of-war on an icy frictionless surface. If the
3 answers
asked by
Hannah
970 views
the height , h(t) in metres of the trajectory of a football is given by h(t) = 2+28t-4.9t^2, where t is the time in flight, in
4 answers
asked by
Poppy
2,470 views
while watching ocean waves at the dock of the bay. otis notices that 10 waves pass beneath him in 30 seconds. he also notices
3 answers
asked by
charlie
1,294 views
"What happens to the energy associated with a wave after the wave has been damped out?"
I'm assuming all the energy is lost by
3 answers
asked by
Stuck
573 views
A shaft which rotates at 300r/min is uniformly accelerated to 600r/min in 15secs.Calculate:
(a) The angular acceleration. (b) The
2 answers
asked by
Ishola
484 views
A balloon originally has a volume of 4.39L
at 44 C and a pressure of 729 torr. What temperature must the balloon be cooled to to
4 answers
asked by
Anonymous
3,204 views
A simple pendulum has a period of 4.50s when the length of the pendulum is shortened by 1.2m, the period is 2.50s. calculate the
4 answers
asked by
Frank
129 views
A simple machine with an effort of 30N lifted a load of 6N. Calculate the mechanical advantages
3 answers
asked by
Anonymous
549 views
Three objects A,B,C are placed 50.0 cm apart along a straight line. A and B have a mass of 10.0 kg, while c has a mass of 15.0
4 answers
asked by
anonymous
858 views
A 20 kg block rests on a rough horizontal table. A rope is attached to the block and is pulled with a force of 80 N to the left.
7 answers
asked by
Mason
7,299 views
two resistors of 25 ohms and 5 ohms respectively are connected in series to a 240V supply calculate the value of a third
5 answers
asked by
Kirchhoffs
1,371 views
a uniform meter rule is pivoted at 20cm mark .
It is balanced when mass of 100gm on 10cm mark and mass of 50 gm on 30 cm mark are
5 answers
asked by
shreya
894 views
A uniform plank AB is 10m long and has mass of 14km. The plank rest on two support at A and B. A lead of mass 8kg is placed on
3 answers
asked by
dawodu ibukun
824 views
in the compton scattering event, the scattered photon has an energy of 120 keV and the recoiling e- has an energy of 40 keV.
4 answers
asked by
paul
964 views
A 135g sample of ice is in a freezer at -21 degrees celsius. It is removed from the freezer and allowed to melt and the
3 answers
asked by
Tegan
883 views
Find the bearing and airspeed for a plane to fly 630 miles due north in 3 hours if the wind is blowing from a direction of 318*
3 answers
asked by
lynn
1,291 views
a body projected with velocity 30m/s an angle 30¡ã with horizontal maximum height attained by he object is.........?
4 answers
asked by
yogesh
1,556 views
A 58 kg skier is coasting down a 250 slope. Near the top of the slope, her speed is 3.6 m/s. She accelerates down the slope
3 answers
asked by
Amiel
1,057 views
what will have a greater effect on the intensity of a sound, doubling its power or halving its distance? Explain your answer.
3 answers
asked by
Kellie
2,823 views
a car starts from rest and accelerates uniformly at 2m/s for 10second. what is its velocity at the end of 10 second?
4 answers
asked by
Anonymous
1,363 views
When a mass of 21 g is attached to a certain
spring, it makes 16 complete vibrations in 4.4 s. What is the spring constant of the
3 answers
asked by
Joanne
1,958 views
A simple pendulum of length is oscillating through a small angle θ in a medium for which
the resistance is proportional to the
5 answers
asked by
shasha
1,620 views
Assuming 100% of your energy can be converted to electrical power, and electricity costs $0.10 for 1 kilowatt-hour, how high
4 answers
asked by
Amber
2,652 views
calculate the amount of heat released when 50g of water at 100degrees hits the skin, condenses, cools the body to 37 degrees
4 answers
asked by
christian
1,722 views
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