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A 38 kg skier skis directly down a frictionless slope angled at 15° to the horizontal. What is Fx if the magnitude of the skier's velocity is constant?
A 1.5 m-long, 750 g rope pulls a 5.0 kg block of ice across a horizontal, frictionless surface. The block accelerates at 5.0 m/s^2 . How much force pulls forward on the rope?
On the sunlit surface of Venus, the atmospheric pressure is 9.0 × 106 Pa, and the temperature is 740 K. On the earth's surface the atmospheric pressure is 1.0 × 105 Pa, while the surfac
If the static head (difference in height of fluid surfaces in the two tanks) is 9m, determine the expected flow rate. Do you think the pump is a good choice? Explain.
A second fragment, whose mass is 3.0 kg, moves away from the point of explosion with a speed of 382 m/s along the negative x axis. How much energy was released in the explosion?
What is the displacement of a car accelerating from 15m/s forward to 10m/s forward in 8.0s? An object accelerates at 9.8m/s^2 when falling. how long does it take an object to change its speed from 4.5
On a workday the average decibel level of a busy street is 72 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 50 every minute on a weekend, what is the dec
How long will it take for the train to completely pass through a half mile long tunnel? You may assume that there is no headwind inside the tunnel.
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?