3447 Questions for the topic physics

6h

What causes the pressure difference between the aorta and the vena cava?

Here are my ideas: loss of energy due to non-conservative forces such as turbulence the channeling and difference in surface area between different areas of the vascular system the difference in... more
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2d

The tip of a propeller on an airplane has a radius of 0.90m and experiences a centripetal acceleration of 8.88*10^4 m/s^2. What is the frequency of rotation of the propeller in rpm?
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2d

Baseball wavelength
A pitcher throws a ball at 60 miles per hour. the batter hits it and sends it flying away from him at 40 miles per hour. Is the deb Broglie wavelength longer before or after the ball is hit and why?
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3d

Calculate the resistance of a Nichrome wire 0.60 mm diameter and 1.30 m long. The resistivity of Nichrome is 100 x 10-8 Ω-m

 Calculate the resistance of a Nichrome wire 0.60 mm diameter and 1.30 m long. The resistivity of Nichrome is 100 x 10-8 Ω-m  
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3d

The electric potential difference between the parallel deflection plates in an oscilloscope is 200 V.
The electric potential difference between the parallel deflection plates in an oscilloscope is 200 V. If the potential drops uniformly when going from one plate to the other and if the distance... more
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3d

Two conducting spheres of the same size have charges q1 = - 5.0 x 10-6 C and q2 = +7.0 x 10-6 C, and their centers are separated by 4.0 cm. What is the force between them?

Two conducting spheres of the same size have charges q1 = - 5.0 x 10-6 C and q2 = +7.0 x 10-6 C, and their centers are separated by 4.0 cm. What is the force between them? 
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3d

A nylon string is stretched between supports 1.20 m apart. Given that the speed of transverse waves .

 A nylon string is stretched between supports 1.20 m apart. Given that the speed of transverse waves in the string is 800 m/s, find the frequency of the fundamental vibration and the first two... more
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4d

Acceleration problem
A person had some bricks left over that weighed 134 kg and instead of taking them one by one on top of the building they decided to use a barrel that weighed 24.3 kg that was attached to a side of... more
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4d

PHYSICS HELP! URGENT!
Bill was told that if he descended in an elevator that he would lose weight. Bill, who has a mass of 246.2 kg, gets in an elevator, places a scale on the ground, stands on the scale, and pushes the... more
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5d

linear momentum in relativity
A body at rest with a mass  comes apart to two bodies moving at opposites directions.The first one has a mass of  and velocity . The second has a mass  and a velocity of .What is the mass of the... more
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6d

Answer to homework problem
A softball pitcher throws an underhanded pitch with the arm fully extended (straight at the elbow). The ball leaves the pitcher's hand with a speed of 25 m/s. Assume that the pitching motion... more
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6d

need help with physics question
A vector representing 110 N is oriented at 24◦ with the horizontal. What is the magnitude of its horizontal component? Answer in units of N.
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6d

If the tire marks show that the two vehicles moved forward after the collision at 4 m/s, what was the speed of the vehicle before the collision? Show a diagram of the momentum “before” and “after”.
In an automobile crash, a vehicle that was stopped st a red light is rear ended by another vehicle. The two cars stick together. The vehicles have the same mass. If the tire marks show that the two... more
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7d

Frictional Force question
A 96 N block rests on a table. The suspended mass has a weight of 32 N. What frictional force is required to keep the blocks from moving?Answer in units of N.
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7d

How much tension in the wire does the bird produce?
The distance between two telephone poles is 36 m. When a 1.52 kg bird lands on the telephone wire midway between the poles, the wire sags 0.146 m.The acceleration of gravity is 9.8 m/s2 .How much... more
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7d

Simple Urgent question: voltage for circuit
A 6V battery, three resistors and three voltmeters are connected. What are the possible readings for each voltmeter?My answer: 3V for top resistor, 3V for second resistor and 6V for the bottom... more
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8d

A stone is thrown off a bridge 180m above a river. if it has an initial velocity given by Vo=(32.0m/s)xhat+(24.0m/s)yhat then determiine the following
a) the maximum height of the projectile relative to the top of the cliffb)the time it takes to reach the river below the cliff
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8d

A force of 10.0 newtons acts at an angle 20.0 degrees from vertical. What are the horizontal and vertical components of the force?
A. The horizontal component is 10.1 newtons, and the vertical component is 0 newtons. B. The horizontal component is 3.42 newtons, and the vertical component is 9.39 newtons.C. The horizontal... more
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225f28a6 61a4 4204 bbe5 a74f32d12952

10d

Breathing and exchange of gasses

Given these lung volumes: 1. tidal volume = 500 mL 2. residual Volume = 1000 mL 3. inspiratory reserve volume = 2500 mL 4. expiratory reserve volume = 1000 mL 5. dead space = 1000 mL The vital... more
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11d

Your 1400-kg car pulls a 590-kg trailer away from a stoplight with an acceleration of 1.90 m/s2 . What force does the trailer exert on the car?
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13d

A plane travels on a heading of 60° for a distance of 300km.

How far north and how far east does the plane travel?
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13d

A baseball pitcher throws a fastball at a speed of 40 m/s
In the throwing motion, the ball is accelerated over a distance of 3.5m. What is the force on the ball?
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13d

A mover is trying to pull a 2750N piano up an incline plane of 20°. What force must the mover apply to move the piano?
The coefficient of friction is 0.17
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13d

How do I solve this Physics problem on the forces and angles?
The angle that the of a handle of a lawnmower makes with the ground in 30°. To Lessen the force needed to push the lawnmower, should the angle be increased or decreased? What angle will require... more
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13d

Show that the period of a circular orbit around the earth, T = 2πr ( 3 2 ) √GmE . Note, period, T, is time taken for an object to complete one revolution.
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