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A model rocket is launched vertically upward. The engine provides a constant thrust force of 8 Newton until the rocket reaches an altitude of 100 meter. After the engine burns out, it continues to coast upward to its maximum altitude. The average mass of the rocket is 0.05 kilogram. Neglecting aerodynamic drag, use energy methods to-
(a) Find the velocity of the rocket at engine burnout?
(b) Find the maximum altitude reached by the rocket?
An electron with kinetic energy 2.20 keV circles in a plane perpendicular to auniform magnetic field. The orbit radius is 26.0 cm. obtain the frequency of circling
The kinetic energy of a proton is 80% of its total energy. What is the momentum in kg·m/s of the proton?
A20 kg wagon is pulled along the level ground by a rope inclined at30 degrees above the horizontal. A friction force of 30 N opposesthe motion. How large is the pulling force if the wagon is moving with (a) constant speed, and (b) an acceleration of ..
A 75g bungee cord has an equilibrium length of 1.2 m. The cord is stretched to a length of 1.8m, then vibrated at 20 Hz. What is the spring constant of the bungee cord
A 70 kg crate is pushed at constant speed up the frictionless 35° ramp shown in the figure. What horizontal force F is required? What force is exerted by the ramp on the crate
The first and second electron shells of an element are filled and there are five electrons in the third electron shell
One gram of water changes from liquid to solid at a constantpressure of 1.00 atm and a constant temperature of 0°C. Find the work done on the water
if a home operates on an average of 1.1 kw electricity how many fuel pellets of uranium dioxide uo2 are required to
A sledge loaded with bricks has a total mass of 17.9 kg and is pulled at constant speed by a rope inclined at 19.8° above the horizontal. What is the tension in the rope
A 15.0 kΩ resistor and a capacitor are connected in series and then a 12.0 V potential difference is suddenly applied across them. Find what is the time constant of the circuit
A kayaker needs to paddle north across a 100m wide harbor. The tide is going out, creating a tidal current that flows east at 2 m/s. The kayaker can paddle with a speed of 3 m/s.
A certain lightbulb has a tungsten filament with a resistance of 19.1 ? when at 20.0°C and 139 ? when hot, Find the temperature of the hot filament
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