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A Cessna aircraft has a lift-off speed of 120 km/h. (a) What minimum constant acceleration does this require if the aircraft is to be airborne after a takeoff run of 270 m? (b) How long does it take t
A model rocket is launched straight upward with an initial speed of 60.0 m/s. It accelerates with a constant upward acceleration of 2.50 m/s2 until its engines stop at an altitude of 190 m. (a) Wha
A ball is thrown upward from the ground with an initial speed of 25 m/s; at the same instant, a ball is dropped from a building 10 m high. After how long will the balls be at the same height?
In Mostar, Bosnia, the ultimate test of a young man's courage once was to jump off a 400-year-old bridge (now destroyed) into the River Neretva, 23 m below the bridge. (a) How long did the jump last
Find the final temperature of the system, assuming no heat is transferred to or from the system.
The balloon is inflated with a sufficient amount of helium gas that the net upward force on the balloon and its load is 30.9 N. Neglect any effects due to the changes of temperature as the altitude
What is the rate of change of the resistance with temperature (dR/dT) at the ice point and the steam point?
The system is initially at 20°C. Then 112 mL of water at 80°C are added to the calorimeter vessel. When thermal equilibrium is attained, the temperature of the water is 54°C. Determine t
Apply conservation of energy to this calorimetry problem. The water is heated, and some evaporated, while the copper piece cools.
One swimmer in a relay race has a 0.30 s lead and is swimming at a constant speed of 6.0 m/s. He has 50 m to swim before reaching the end of the pool. A second swimmer moves in the same direction as
The ratio of the power radiated by the sun and Betelguese, PSun/PBet , is ________________. Assume the emissivity of the stars is the same. The surface area of a sphere is A=4πr2.
How does the power radiated by an object change if the temperature T of the radiating object changes? Here we ignore the surroundings at temperature Te. In particular, if T is halved, then the powe
In a certain right triangle, the two sides that are perpendicular to each other are 3.70 m and 5.40 m long. What is the tangent of the angle for which 3.70 m is the opposite side?
What is the difference between potential energies for dipole orientations parallel to and antiparallel to ?
In the subsequent motion the block oscillates in simple harmonic motion. write an expression for the displacement, velocity, and acceleration of the block as a function of time.
The force on q1 due to q2 equals the force on q1 due to the electric field of the parallel plate capacitor. What is the distance r between the two charges?
When the calorimeter and its contents are weighed, 1.2 g of water are found to have evaporated. What was the temperature tC?( in degrees celcius)
A 3.4 kg mass attached to a spring is displaced 6.2 cm from the equilibrium position. It is released and then oscillates with a frequence of 3.1 Hz. a) What is the energy of the motion when the mass
A mass, m1 = 7.98kg is at rest on a frictionless horizontal surface and connected to a wall by a spring with k= 64.6 N/m. A second mass, m2 =4.94kg, is moving to the right at v0= 26.2 m/s. The two
The press box at a baseball park is 36.0 ft above the ground. A reporter in the press box looks at an angle of 13.1° below the horizontal to see second base. What is the horizontal distance fro
An 80 kg construction worker sits down 2.0 m from the end of a 1450 kg steel beam to eat his lunch. The cable supporting the beam is rated at 15,000 N. Should the worker be worried?
An astronomical unit (AU) is the average distance of Earth from the Sun, approximately 1.50 × 108 km. The speed of light is about 3.0 × 108 m/s. Express the speed of light in terms of astr
A severe thunderstorm dumped 2.8 in of rain in 30 min on a town of area 34 km2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.
Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of 0.108 N when separated by 0.500 m. The spheres are then connected by a thin conducting wire. When
The first submarine travels at an average velocity of 20 km/hr for the first 500 km, 40 km/hr for the next 500 km, 30 km/hr for the next 500 km and 50 km/hr for the final 500 km. In the plot, the se