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A 1 000-kg experimental rocket sled at rest on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20-s "burn." The rocket moves at 150 m/s after the burn.
Parallel rays of green mercury light with a wavelength of 546 nm pass through a slit with a width of 0.437 mm. What is the distance from the central maximum to the first minimum on a screen 1.75 mm
Eukaryotic cells are more complex than prokaryotic cells. Explain their differences, functions and the composition of each including how genetic material is replicated
A pitcher throws a curveball that reaches the catcher in 0.55 s. The ball curves because it is spinning at an average angular velocity of 280 rev/min (assumed constant) on its way to the catcher's
A locomotive is accelerating at 1.9 m/s2. It passes through a 20.0-m-wide crossing in a time of 2.3 s. After the locomotive leaves the crossing, how much time is required until its speed reaches 33
One below the horizontal and one above the horizontal. What is the distance between the points where the stones strike the ground?
A cue ball initially moving at 2.6 m/s strikes a stationary eight ball of the same size and mass. After the collision, the cue ball's final speed is 0.97 m/s at an angle of alpha with respect to its
(a) Determine the number of atoms in 1 cm3 of copper. (b) Visualize the one cubic centimeter as formed by stacking up identical cubes, with one copper atom at the center of each. Determine the volum
An object weighing 338 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 302 N. Immersed in oil, the object weighs 313 N. Calculate the density
Scientists have successfully cloned sheep and cattle for several years.
A 550N physics students stand on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 450N. (a) Find the acceleration of the elevator(magnitude and direction). (b) What is
The crate has an initial speed of 1.60 m/s. It is pulled a distance of 5.90 m. What is the change in mechanical energy of the crate? Answer in units of J and use 9.8 m/s2 for g.
Assuming that the pass was thrown at the optimal 45 ^circ angle, what was the speed at which the ball left the quarterback's hand?
Three equal point charges, each with charge 1.80micro coulombs , are placed at the vertices of an equilateral triangle whose sides are of length 0.200 . What is the electric potential energy of the
Fish do not all have the same skeletal structure. Describe the differences among fish from the most primitive to more advanced types.
The pellet strikes the ground with a speed of 31.0 m/s. How far above the cliff edge would the pellet have gone had the gun been fired straight upward?
An electron with an initial speed of 5.50×105 is brought to rest by an electric field. What was the potential difference that stopped the electron?
An archer puts a 0.30 kg arrow to the bowstring. An average force of 402 N is exerted to draw the string back 1.3 m.
A force vector F of magnitude 2.30 N is exerted on the plunger, making medicine squirt from the needle. Determine the medicine's flow speed through the needle. Assume the pressure in the needle rema
A parachutist with a camera, both descending at a speed of 13.3 m/s, releases the camera at an altitude of 66.5 m. What is the magitude of the velocity of the camera just before it hits the ground?
An elastic cord is 65 cm long when a weight of 55 N hangs from it and is 87 cm long when a weight of 82 N hangs from it. What is the "spring" constant of this elastic cord?
What is the correct "motion camouflage" speed of approach for a dragonfly pursuing its prey at the angle 68.5 degrees. Typical speed is 0.75 m/s and 48.5 degrees
A barefoot field-goal kicker imparts a speed of 48 m/s to a football initially at rest. If the football has a mass of 0.75 kg and the time of contact with the ball is 0.013 s, what is the force exer
Specify which muscles are pulling on which bones and what types of joints are involved in stepping up on the step.