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If the string's linear density is 0.700g/m and the tension is 140N , how long is the vibrating section of the violin string?
Luke suffers from acrophobia, a fear of high places. Luke's therapist suggests that his reaction to heights is a generalization of the fear triggered by a childhood playground accident in which he
A copper block from a 300°C oven and immediately dropped into 1.00 kg of water at 20°C. The water rises to 25.5°C and then remains at that temperature. What is the mass of the copper block
At what time is the angular velocity of the motor shaft zero? Calculate the angular acceleration at the instant that the motor shaft has zero angular velocity.
Explain the reasoning behind the rows of "crash barrels" we often see by cement barriers on the highway.
A 20-rm kg loudspeaker is suspended 2.0 rm m below the ceiling by two ropes that are each 30^circ from vertical. What is the tension in the ropes?
Assume the mass of the Sun is 1.61 × 1030 kg, and the mass of a hydrogen atom is 1.672 × 10-27 kg. How many atoms are there in the Sun?
A person is pulling a block of mass m with a force equal to its weight directed 30 degrees above the horizontal plane across a rough surface, generating a friction f on the block. If the person is
List the four components of the interstellar medium (ISM) in order of increasing temperature.
What is the proton-proton chain? Describe what it is and how it works. Describe the formation of the solar system from the solar nebula.
You use your thumb to exert a force of 30 newtons on the head of a thumbtack. The head of the thumbtack is a circle of radius 5 mm. What is the pressure on your thumb?
what is the average volume (in cubic meters) required for each iron atom and (b) what is the distance (in meters) between the centers of adjacent atoms?
The spacecraft took 1.04 days to make one complete circular orbit around Eros. Calculate what the mass of Eros must be.
Oriented so that the angle between the polarizing directions of adjacent sheets is 48o. What fraction of the incident intensity is transmitted by the system?
You stop for a moment to add a bag of dog food to your cart. With a force of 12.0 N, you now accelerate the cart from rest through a distance of 2.02 m in 3.00 s. What was the mass of the dog food?
A negatice charge ( q = -0.75 Coulombs) is placed above a floor that has a net positive charge. What is the magnitude and direction of the electric force caused by the floor on the negative charge?
Calculate the rate at which internal energy is produced in 2.50 m of 12-gauge copper wire carrying a current of 20.0 A.
David suggested that the atrocities were committed because the Germans had become unusually cruel, sadistic people with abnormal and twisted personalities. Use your knowledge of the fundamental attr
How far will the trampoline stretch if the performer stands still on it while taking a bow?
An elastic band (spring constant= 89 N/m) is used to drag a 2.6 kg block across a rough surface. The block moves at a constant speed when the extension of the elastic is 7.9cm. Find the amount of p
When an object of weight 3160 N is hung at the center of the rope, the rope is observed to sag by 35 cm. Calculate the tension in the rope.
A 120-V motor has mechanical power output of 3.70 hp. It is 82.0% efficient in converting power that it takes in by electrical transmission into mechanical power. If the electric company charges $0
Consider a group of 4000 protons. Calculate the magnitude of the electric field 32 cm from the collection of protons.
Suppose that an ideal frictionless inclined plane has an angle of inclination of 5.00° with respect to the horizontal. What is the acceleration of an object sliding down that plane? Assume that
A 0.5-Kg air-hockey puck is initially at rest. What will its kinetic energy be after a net force of 0.8 N acts on it for a distance of 2m? Hint: Use the work energy Theorem.