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Suppose that two heat engines are connected in series, such that the heat exhaust of the first engine is used as the heat input of the second engine as shown below. The efficiencies of the engines
A police car has an 850-Hz siren. It is traveling at 32 m/s on a day when the speed of sound through air is 342 m/s. The car approaches and passes an observer who is standing along the roadside. Wh
A piece of concrete measures 3 ft by 3ft by 1.25ft. (a) What is its weight? (b) Find the buoyant force that acts on it when it is submerged in water. (c) What is the net force on the concrete piece
A 1.25 object is moving in the direction at 17.4 . Just 3.51 later, it is moving at 27.8 at 36.0 to the axis.What is the magnitude of the force applied during this time?
An airplane is flying in a horizontal circle at a speed of 0 90m/s at an angle of 23.0 above the horizontal. when the plane is 114 m directly above a dog that is standing on level ground a suitcase
Two 10-cm-long thin glass rods uniformly charged to + 10;{rm nC} are placed side by side, 4.0 cm apart. What are the electric field strengths E_1, E_2, and E_3 at distances 1.0 cm, 2.0 cm, and 3.0 c
The coefficients of friction between the box and roof are shown. The system is not moving. Find the friction force on the bag of gravel.
The tungsten filament of a light bulb has an operating temperature of about 2 100 K. If the emitting area of the filament is 1.0 cm2, and its emissivity is 0.68, what is the power output of the lig
If this pull now does 59.0 {rm J} of work on the box while pulling it through the same distance, what angle does the force make with the horizontal?
What is the kinetic energy of a ideal projectile of mass 18.3 kg at the apex (highest point) of its trajectory, if it was launched with an initial speed of 40.5 m/s and an initial angle of 41.5°
The hiker finds that for the whole trip of three legs her net displacement has magnitude 25 m and is directed at angle 180±. What is the angle of the third leg?
A 2.86 x 10-2-kg block is resting on a horizontal frictionless surface and is attached to a horizontal spring whose spring constant is 110 N/m. The block is shoved parallel to the spring axis and i
The linear impulse delivered by the hit of a boxer is 248 N · s during the 0.373 s of contact. What is the magnitude of the average force exerted on the glove by the other boxer?
An open train car moves with speed 15.8 m/s on a ?at frictionless railroad track, with no engine pulling the car. It begins to rain. The rain falls straight down and begins to ?ll the train car.
Write an expression for the terminal speed in terms of the given variables. Describe and explain the relationship between vT and R.
What is the tension in the rope if the box has v = 8.0 {rm m/s} and is speeding up at 3.0 {rm m/s^2}?
What is the radius of curvature of the path of a 2.0-keV proton in a perpendicular magnetic field of magnitude 0.80 T?
Residents of the house use 0.35 m3 of water per day. The day's pumping is completed in 2 hours during the day. a) Calculate the minimum work required to pump the water per day.
What is the tension T in each of the cables? Use 9.80 {rm m/s}^2 for the magnitude of the acceleration due to gravity
How do you calculate the angular momentum change that a planet experiences as it is struck by an asteroid perpendicular to the radius.
If the coefficient of static friction between the box and the plank is 0.21, what is the maximum amount the spring can be stretched and the box remain at rest?
An elevator cab in the New York Marriott Marquis has a mass of 4.43 x 103 kg and can carry a maximum load of 1.80 x 103 kg. If the cab is moving upward at full load at 3.80 m/s, what power is requi
Assuming the unit produces 1/10 hp at 70.0% mechanical efficiency (i.e. 70% of input electric power is converted to mechanical work), calculate its performance coefficient.
A ship sets out to sail to a point 176 km due north. An unexpected storm blows the ship to a point 108 km due east of its starting point. How far must it now sail to reach its original destination?
A staging that weighs 140 N supports two painters, one 320 N and the other 420 N. The reading in the left scale is Fl = 610 N. What is the reading Fr in the right hand scale?