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A helicopter is flying in a straight line over a level field at a constant speed of 5.4 m/s and at a constant altitude of 8.9 m. A package is ejected horizontally from the helicopter with an initial velocity of 15.0 m/s relative to the helicopter, and in a direction opposite the helicopter's motion. The initial velocity of the package relative to the ground is -9.6m/s. The angle the velocity vector of the package makes with the ground at the instant before impact, as seen from the ground is 54 deg.
How would you calculate the angle the velocity vector makes with the ground at the instant before impact, as seen from the ground? ( know the answer is 54 degrees, but I want to know how they derived it). Thanks!
A platinum resistance thermometer has resistances of 190.0 when placed in a 0°C ice bath and 234.8 when immersed in a crucible containing a melting substance. What is the melting point of this substance
A spherical ball of charge has radius R and total charge Q. The electric field strength inside the ball(r?R) is E(r)=Emax(r4/R4). Find an expression for the volume charge density ?(r) inside the ball as a function of r
A race car has a mass of 718 kg. It starts from rest and travels 45.0 m in 3.0 s. The car is uniformly accelerated throughout the entire time. What net force is exerted on it.
A friend of yours is loudly singing a single note at 400 Hz as driving toward you at 250 m/s on a day when the speed of sound is 340 m/s
In a certain compound microscope, the object is 9.0 mm from the objective. What overall magnification is produced
A nuclear power plant produces an average of 4.90 × 103 MW of power during a year of operation. Find the corresponding change in mass of reactor fuel
An object is placed 50 cm in front of a convex mirror and its image is found to be 20 cm behind the mirror. What is the lateral magnification
Light from a He-Ne laser (= 632.8) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.10 from the slits. The figure shows the interference pattern observed on the screen.
A spring of spring constant k = 340 Nm-1 is used to launch a 1.5-kg block along a horizontal surface by compressing the spring by a distance of 18 cm. how far does the block slide
Two tiny conducting spheres with a mass of 15gm each are hanging from non-conducting threads of length 70cm such that they are 4cm apart as shown to the left.
You have two weeks vacation and want to travel to a gambling space colony located 3.22 x 10^14 meters from Earth. how fast must you travel to accomplish this
What is the peak current (in Amperes) in the filament of a 60W light bulb? Assume it is connected to a standard household A.C.
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