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An airplane can fly 470 miles with the wind in the same amount of time as it can fly 340 miles against the wind. If the wind speed is 26 mph, find the speed of the plane in still air.
If a 60 W light bulb at 120 V is left on in your house to prevent burglary, and the power company charges 10 cents per kilowatt-hour, how much will it cost to leave the bulb on for 30 days? Show you
A brick is thrown vertically upward with an initial speed of 4.80 m/s from the roof of a building. If the building is 74.0 m tall, how much time passes before the brick lands on the ground?
Lonnie pitches a baseball of mass .2 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the
By what length would these rails change between a cold day when the temperature is -10 degrees C and a hot day a 30 degrees C?
The mean distance between earth and the sun is 1.50 x 1011 m. The average intensity of solar radiation incident on the upper atmosphere of the earth is 1390 W/m2. Assuming the sun emits radiation un
the volume of inside of house is 240.16ft3. the air sh; 0.24btu/lbF and the density is 0.075lb/ft3. what rate should air be moving through the open window in order to keep the system in equilibrium?
find the components of the force exerted by the wall on the steel bar.
Find the speed of transverse waves on this string. If the tension in this string is increased by 1.0%, what will be the new fundamental frequency of the string?
You are trying to slide a refrigerator across a horizontal floor. The mass of the refrigerator is 188 kg, and you need to exert a force of 347 N to make it just begin to move. What is the coefficien
A football player runs directly down the field for 35m before turning to the right at and angle of 225 degrees from his original direction and running an additional 15m before getting tackled. What
The temperature is kept at 3 degrees Celsius. How much heat is transferred from the water to cool it to 3 degrees Celsius?
A 0.45-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 75N, what
You place one end of the pole on a fence post and hold the other end of the pole 35cm from its tip. How much force must you exert to keep the pole motionless and horizontal?
what maximum height above the ground will the rocket achieve? The acceleration of gravity is 9.8 m/s2 . Answer in units of km.
In terms of A_1, what is the amplitude for the same driving frequency and the same driving force amplitude F_{max}, if the damping constant is 3b_{1}?
The initial height of the block is 0.5 m above the lowest part of the slide and the spring constant is 450 N/m.(a) What is the block's speed when it is at a height of 0.25 m above the base of the slid
A charge of 1.50×10-8 C lies on an isolated metal sphere of radius 16 cm. With V = 0 at infinity, what is the electric potential at points on the sphere's surface?
A 0.25 kg length of aluminum wire is warmed 10.0°C by an electric current. How much heat was generated by the current?
The objects are released from rest, and m2 slides 1.00m down the incline in 4.00s. Determine (a) the acceleration of each object, (b) the tension in the string, and (c) the coefficient of kinetic fr
Two 9.0 cm diameter charged disks face each other, 25 cm apart. Both disks are charged to - 80 nC. What is the electric field strength at the midpoint between the two disks?
A gas expands when 619 J of energy is added to it by heat. The expanding gas does 442 J of work on its surroundings. What is the overall change in the internal energy of the gas? Answer in units of
The 22 cm long gardening tool shown here is used to pull weeds. If a 1.23 N•m torque is required to pull a given weed, what force did the weed exert on the tool?
A spring is stretched as shown at right and released at position x=0.1m at time t=0. The mass is 3kg and the spring constant is given by k=27N/m. Assume a frictionless system. (a) Find the angular f
A simple generator has a 620-loop square coil 21.0 cm on a side. How fast must it turn in a 0.690 T field to produce a 140 V peak output?