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A model rocket engine has an average thrust of 5.26 N. It has an initial mass of 25.8 g, which includes fuel mass of 13.2 g. The duration of its burn is 1.90 s. (Assume all the fuel is consumed.)
(a) What is the average exhaust speed of the engine?
m/s
(b) This engine is placed in a rocket body of mass 42.5 g. What is the magnitude of the final velocity of the rocket if it were to be fired from rest in outer space by an astronaut on a spacewalk? Assume the fuel burns at a constant rate.
A projectile is shot from the edge of a cliff h = 105 m above ground level with an initial speed of v0 = 135 m/s at an angle of 37.0Â ° with the horizontal.
A cement block accidienatlly falls from rest from the ledge of a 63.7 -m-high building when the block is 18.2m above the ground a man 2.00m tall looks up notices that the block is directly above him
As blood passes through the capillary bed in an organ, the capillaries join to form venules (small veins). what is the total cross-sectional area of the capillaries feeding these venules
A spring with a spring constant of 224.8 N/m is compressed by 0.229 m. What is the speed of the ball bearing right after it loses contact with the spring
a ball rolls down a 100m.the hill is inclined at 60 degrees. if the ball has a rotational inertia of 10kg-m^2 and starts from rest, what is the final rotational speed of the ball?(you must use the conservation of energy)
Calculate the ground state energy of of pi-electrons in octatetraene, C8H10, using the particle in a box model. To calculate the box length, assume that the molecule is linear and use the values 1.35 and 1.54 angstroms
Use the worked example above to help you solve this problem. A ball is thrown upward from the top of a building at an angle of 30.0° to the horizontal, How long does it take for the ball to hit the ground
A small electric car overcomes a 250 N friction force when traveling 30 km/h. The electric motor is powered by ten 12 V batteries connected in series and is coupled directly to the wheels whose diameters are 50 cm.
A damped mass-spring system oscillates at 280 Hz. The time constant of the system is 2.0 s. At t = 0, the amplitude of oscillation is 8.4 cm and the energy of the oscillating system is then 84 J.
A person swimming underwater sees a lifeguard who is standing in the shallow part of the pool; the water comes up to the lifeguard's waist. In what way does the swimmer see lifeguard's upper body distorted.
An AC voltage of rms value 413 V and frequency 75 Hz is connected across a light bulb with a resistance of 471 ohms. What is the rms current and maximum current
Studies of the relationship of the sun to our Galaxy- The Milky Way - Have revealed that the sun is located near the outer edge of the galatic disc, what is the period of the sun's galactic motion
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