374 Answered Questions for the topic physics B

10/29/20

A 20 cm high polystyrene board with a surface area of 40 dm2 is floating in the water.
a) What fraction of its volume is above the water surface?b) If a 35 kg child is placed on this board, what will be the fraction of its volume that is above the water surface?Data: Polystyrene... more
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10/29/20

A piece of copper immersed in water has an apparent weight of 2.65 N and when it is immersed in a liquid of density 1.50 x 103 kg/m3 its apparent weight is 2.50 N.
Is it pure copper or does it contain any other metal? Copper density 8.9 X 103 kg/m3.
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10/29/20

A fluid pressure gauge, called a Venturi tube, or venturer, is a device designed to measure the velocities of fluids flowing through pipes.
It consists of a tube that is inserted in the pipe, has the same diameter as this one, gradually narrowing and then increasing, the section also gradually to avoid the formation of swirls and thus... more
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10/29/20

Block and ramp help
A block starts with a speed of 15 m/s at the bottom of a ramp that is inclined at an angle of 30 ̊ above the horizontal. The coefficient of kinetic friction between the block and the plan is 0.2.... more
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10/29/20

Roller coaster help
roller coaster has a mass of 840 kg. It is launched horizontally from a giant spring with spring constant 31,000 N/m into a frictionless vertical loop-the-loop track of radius 6.3 m. What is the... more
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10/29/20

Urgent help physics

You are driving your car uphill along a straight road. Suddenly you see a car run a red light and enter the intersection just ahead of you. You slam on your brakes and skid in a straight line to a... more
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10/29/20

Physics kinematic
1. as the race begins you accelerate at a constant rate of 0.49 m/s^2 . the finish line is 100m away from the starting line, what was your velocity as you crossed the finish line.for this question... more
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10/29/20

Physics Kinematic Equations
1. the finish line is 100m away from the starting line, you manage to get there in 4 seconds (10 seconds faster than your friend) what was your average velocity during the race?for this question... more
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10/23/20

Physics question
1. if during a 60 second jog, my average velocity is 5 m/s, how far from my starting point do i end up(what is my displacement ) in meters
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10/21/20

URGENT HELP PHYSICS CART
In the physics lab, a cart of mass m1 = 0.30 kg moves with velocity v1 = 2.5 m/s on a frictionless track. It collides with another cart of mass m2 = 0.40 kg, which is initially stationary. The... more
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Physics B Math Physics Physics C

10/21/20

 In the movie clip from Ice Age, dodo birds are chasing a watermelon that accidentally falls off a cliff
 In the movie clip from Ice Age, dodo birds are chasing a watermelon that accidentally falls off a cliff, The watermelon has a horizontal velocity of 8.0 m/s. It is in free fall for 6.0s. How far... more
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10/16/20

Physics, 5 questions

1. The force of a surface pushing back on an object is called the _____ force?a. gravityb. normalc. tensiond. friction2. the force of a rope, string, or similar object pulling on an object is... more
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10/07/20

restricted block on spring
A block of mass m = 4.5 kg slides back and forth on a frictionless horizontal track. It is attached to a spring with a relaxed length of L = 3 m and a spring constant k = 17 N/m. The spring is... more
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10/07/20

mass on vertical spring
A spring with spring constant k = 35 N/m and unstretched length of L0 = 2.4 is attached to the ceiling. A block of mass m = 2 kg is hung gently on the end of the spring.1) How far does the spring... more
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10/05/20

block sliding please help
A mass m = 14 kg rests on a frictionless table and accelerated by a spring with spring constant k = 4983 N/m. The floor is frictionless except for a rough patch. For this rough path, the... more
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09/22/20

What is the magnitude of the total force between the bike tire and the road?
A physicist rides his bike around a corner of radius 21 meters at a steady speed of 7.5 m/sec. The combined mass of the physicist and the bike is 98 kg. The coefficient of static friction between... more
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09/20/20

flight problem :
Suppose they are two flights one from Tokyo to Turkey and another from Turkey to Tokyo they both start flying at one time (turkey time zone ) .Is the duration for both flights the same (will they... more
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09/20/20

flight problem :
Suppose they are two flights one from Tokyo to Turkey and another from Turkey to Tokyo they both start flying at one time (turkey time zone ) .Is the duration for both flights the same (will they... more
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09/09/20

PHYSICS SPEED X VELOCITY

The train moves 60 kilometers forward, and then 30 kilometers backwards. The whole journey takes 5 hours. What is the distance the train has travelled? What is the displacement of the train? What... more
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09/07/20

find average acceleration
An object is moving along the x axis. At t = 5.8 s, the object is at x = +3.0 m and has a velocity of +4.2 m/s. At t = 7.1 s, it is at x = +9.0 m and its velocity is -1.0 m/s. Find the average... more
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09/02/20

Two particles with charges +6e and -6e are initially very far apart (effectively an infinite distance apart). They are then fixed at positions that are 6.52 x 10-12 m apart.
Two particles with charges +6e and -6e are initially very far apart (effectively an infinite distance apart). They are then fixed at positions that are 6.52 x 10-12 m apart. What is EPEfinal -... more
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09/02/20

The drawing shows a square, each side of which has a length of L = 0.250 m. Two different positive charges q1 and q2 are fixed at the corners of the square.
The drawing shows a square, each side of which has a length of L = 0.250 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a... more
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09/01/20

An empty capacitor is capable of storing 1.0 × 10-4 J of energy when connected to a certain battery. If the distance between the plates is halved and then filled with a dielectric (κ = 3.3),

An empty capacitor is capable of storing 1.0 × 10-4 J of energy when connected to a certain battery. If the distance between the plates is halved and then filled with a dielectric (κ = 3.3), how... more
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08/31/20

late to class physics question
It normally takes you 11.5 minutes to travel the 6 miles to COD along a straight road. You leave 13 minutes before Physics 2111 class begins. Delays caused by a broken traffic light slow down the... more
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08/31/20

accelerating objects
An object starts at time t = 0 seconds with a velocity of v0 = +48 m/s and undergoes a constant acceleration of a = -16 m/s2.1) At what time does the speed of the object reach zero? (The object's... more
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