Do this problem by making a neat, precise scaled drawing, using a ruler and protractor, ready to be turned in at the start of our next class. NOTE: "azimuth" means compass direction. North is considered 0°, east is 90°, south is 180°, and west is 270°.
Dr. Evil has been captured and is in a prison awaiting trial. His minions fly a helicopter to the prison, land in the courtyard, and hurriedly get him aboard. They take off. Hoping to confuse the police, they fly 35 km at azimuth 72°, then turn and go 57 km toward azimuth 52°, then turn again and fly 30 km at azimuth 325°, arriving at Dr. Evil's secret lair.
1. How far east of the prison is Dr. Evil's lair? (Negative if the final position is west.)
2. How far north of the prison is Dr. Evil's lair? (Negative if the final position is south.)
The prison authorities track the flight on radar, and thereby learn the location of Dr. Evil's secret lair. They have another helicopter, and take off to recapture Dr. Evil. They fly straight there from the prison.
3. How far do they have to fly distance:
4. and in what direction? azimuth: °
In: Physics
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A pendulum 2.20 m long is released (from rest) at an angle ?0=30.0?. (Figure 1) |
Part A Determine the speed of the 50.0 g bob at the lowest point (?=0). Express your answer with the appropriate units.
SubmitRequest Answer Part B Determine the speed of the 50.0 g bob at ?=15.0?. Express your answer with the appropriate units.
SubmitRequest Answer Part C Determine the speed of the 50.0 g bob at ?=?15.0? (i.e., on the opposite side). Express your answer with the appropriate units.
SubmitRequest Answer Part D Determine the tension in the cord at the lowest point (?=0). Express your answer with the appropriate units.
SubmitRequest Answer Part E Determine the tension in the cord at the ?=15?. Express your answer with the appropriate units.
SubmitRequest Answer Part F Determine the tension in the cord at ?=?15.0?. Express your answer with the appropriate units.
SubmitRequest Answer |
In: Physics
David is driving his prius on the freeway and reaches his exit. The exit has a radius of curvature of 25 m and is banked at 38 degrees. How fast can David travel around the curve on a dry day (where the coefficient of friction between his tires and the road is 1)? How fast can he travel around the curve on a rainy day (when the coefficient of friction between his tires and a wet road is 0.75)? Give your in miles per hour. Show all work and explain each step.
In: Physics
Firemen are shooting a stream of water at a burning building. A high-pressure hose shoots out the water with a speed of 27.0m/s as it leaves the hose nozzle. Once it leaves the hose, the water moves in projectile motion. The firemen adjust the angle of elevation of the hose until the water takes 3.30s to reach a building 45.0m away. You can ignore air resistance; assume that the end of the hose is at ground level.
A) Find the angle of elevation of the hose.
B) Find the speed of the water at the highest point in its trajectory. (m/s)
C) Find the acceleration of the water at the highest point in its trajectory. (m/s^2)
D) How high above the ground does the water strike the building? (m)
E) How fast is it moving just before it hits the building? (m/s)
In: Physics
When you calculate the net electric field in a location due to
the presence of more than one large charge (Q), it is generally not
helpful to include the sign of the charges in the
equation for electric field. Why not? Specifically, what does the
sign of a charge tell you about the direction of the electric
field, and what does the sign of a charge NOT tell you
about the direction of the electric field?
In: Physics
1.) What is the Hall effect, give a real life example, list its applications.
2.) When an electric light bulb is operated on a low frequency AC, they noticeably flicker (for example 5Hz) why?
In: Physics
1. Use basic laws of physics to explain the following situations:
a. Spiderweb has a greater tensile strength than steel, yet you can snap a spider web very easily with your hand. Explain why this is so.
b. Use Bernoulli's Principle to explain how the shape of an airplane wing creates a "lift force."
c. Why is it easier to sew with a sharp needle than it is to sew with a dull one?
d. Describe how the speedometer of your car is able to tell how fast the car is going.
In: Physics
One billiard ball is shot east at 1.9m/s . A second, identical billiard ball is shot west at 0.90m/s . The balls have a glancing collision, not a head-on collision, deflecting the second ball by 90? and sending it north at 1.31m/s .
1.)What is the speed of the first ball after the collision?
2.)What is the direction of the first ball after the collision? Give the direction as an angle south of east.
In: Physics
is astronomy based on probability and chance? Are certain laws well defined, and verified through experimentation?
In: Physics
Moon effect. Some people believe that the Moon controls their activities. If the Moon moves from being directly on the opposite side of Earth from you to being directly overhead, by what percentage does (a) the Moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? Assume that the Earth–Moon (center-to-center) distance is 3.82 × 108 m, Earth's radius is 6.37 × 106 m, Moon's mass is 7.36 × 1022 kg, and Earth's mass is 5.98 × 1024 kg.
In: Physics
When a potential difference of 142 V is applied to the plates of a parallel-plate capacitor, the plates carry a surface charge density of 45.0 nC/cm2. What is the spacing between the plates?
In: Physics
I need an in depth, thorough explanation of static electricity and the relevant related topics!
In: Physics
A concave mirror (f = 44 cm) produces an image whose distance from the mirror is one-fourth the object distance. (a) Determine the object distance. cm (b) Determine the (positive) image distance. cm
In: Physics
Calculate the total kinetic energy of the reaction products in
the reaction 13C(d,n)14N if
the incident d particle has KE = 3000 keV?
(in MeV)
In: Physics