Physics

A drunken sailor stumbles 600 meters north, 550 meters northeast, then 500 meters northwest. What is the total displacement and the angle of the displacement?
2 Answers
You are driving to the grocery store at 18 m/s. You are 130 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 s and that your car brakes with constant acceleration.a. How far are you from the intersection when you begin to apply the brakes? b. What acceleration will bring you to rest right at the intersection? c. How long does it take you to stop?
2 Answers
t requires1200 kg of coal to produce the energy needed to make 1.0 kg of aluminum metal. If a single soda can requires approximately 15 g of Al, what mass of coal would be needed to produce a 6-pack of cans?
1 Answer
The ozone molecule O3 has a permanent dipole moment of 1.81030 Cm. Although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.51010 m with the dipole moment perpendicular to the axis of the rod. Suppose an ozone molecule is in a 8000 N/C uniform electric field. In equilibrium, the dipole moment is aligned with the electric field. But if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.What is the frequency f of oscillation?
1 Answer
"1.0 kg mass is attached to the end of a spring. The mass has an amplitude of 0.10 m and vibrates 2.0 times per second. Find its speed when it passes the equilibrium position."
2 Answers
A dog running in an open field has components of velocity vx = 2.6 m/s and vy = -1.8 m/s at t1 = 10.0 s. For the time interval from t1 = 10.0 s to t2 = 20.0 s, the average acceleration of the dog has magnitude 0.45 m/s2 and direction 31.0o measured from the + x-axis toward the + y-axis. At t2 = 20.0 s, (a) what are the x- and y-components of the dogs velocity? (b) What are the magnitude and direction of the dogs velocity? (c) Sketch the velocity vectors at t1 and t2. How do these two vectors differ?
1 Answer
Naomi has increased the pressure on a solution of liquid and gas in a closed container. This will _______amount of gas held in her solutionthe
2 Answers
A cylinder at left has balls stacked near its bottom with an arrow leading to a cylinder at right with balls evenly spaced throughout the cylinder. Which change of state is shown in the model? condensation evaporation sublimation deposition
2 Answers
Four point charges each having charge Q are located at the corners of a square having sides of length a. (a) Find an expression for the total electric potential at the center of the square due to the four charges. (Use any variable or symbol stated above along with the following as necessary: ke.)
1 Answer
By what mechanical adjustments can you speed up or slow down an old-fashioned grandfatherpendulum clock?A)By changing the elongation angle of the pendulumB) By giving the pendulum a slight nudge into or against its motion directionC) By altering the length of the pendulumD)Either of the above worksE) None of the above works
1 Answer
4. Elements that lie along the stair step line of the periodic table area. metalsc. liquidsb. metalloidsd. radioactive
2 Answers
A student decides to measure the muzzle velocity of a pellet shot from his gun. He points the gun horizontally. He places a target on a vertical wall a distance x away from the gun. The pellet hits the target a vertical distance y below the gun. (a) Show that the position of the pellet when traveling through the air is given by y = Ax^2, where A is a constant. (b) Express the constant A in terms of the initial velocity v and the free-fall acceleration g. (c) If x = 3 m and y = 0.21 m, what is the initial speed of the pellet?
1 Answer
Careers in this career cluster also include related professional and technical support activities such as production planning and control, maintenance and manufacturing/process engineering.A. TrueB. False
1 Answer
A hammer taps on the end of a 4.0-m-long metal bar at room temperature. A microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. The pulses are separated in time by 11.0 ms. 1. What is the speed of sound in this metal? v = 6060 m/s 2.If the bar was twice as long, what would be the time difference?
1 Answer
An astronaut is in space with a baseball and a bowling ball. The astronaut gives both objects an equal push in the same direction. Does the baseball have the same inertia as the bowling ball? Why? Does the baseball have the same acceleration as the bowling ball from the push? Why? If both balls are traveling at the same speed, does the baseball have the same momentum as the bowling ball?
1 Answer
A motorist is driving at 20m/s when she sees that a traffic light 200m ahead has just turned red. She knows that this light stays red for 15s, and she wants to reach the light just as it turns green again. It takes her 1.0s to step on the brakes and begin slowing. What is her speed as she reaches the light at the instant it turns green?
2 Answers
NASA communicates with the Space Shuttle and International Space Station using Ku-band microwave radio. Suppose NASA transmits a microwave signal to the International; Space Station using radio waves with a frequency of 18.0 GHz. What is the wavelength of these radio waves?
1 Answer
As Halleys comet orbits the sun, its distance from the sun changes dramatically. If the comets speed at a distance of 9.8 1010 m from the sun is 5.3 104 m/s and angular momentum is conserved, what is its speed when it is 3.6 1012 m from the sun? Assume the comet can be treated as a point mass. Ignore radial components of momentum
2 Answers
I am sitting on a train car traveling horizontally at a constant speed of 50 m/s. I throw a ball straight up into the air. Describe the motion of the ball as I see it. Is the path taken by the ball different than if I was sitting at rest at home and I threw a ball straight up into the air?
1 Answer
A real car moving at 10 km/h has more momentum than a toy car moving at the same speed because the real car ____.A. generates less frictionB. has greater massC. has less massD. has greater forward motion
2 Answers
Design an op-amp circuit to provide an output vO =[2v1 + (v2/2)]. Choose relatively low values of resistors but ones for which the input current (from each input signal source) does not exceed 50 A for 1-V input signals.
1 Answer
How high would you need to lift a 2 kg bottle of soda to increase its potential energy by 50 Joules? (use G=10 N/KG.)
1 Answer
Which of the cities that we examined experienced the least significant temperature increase (smallest slopes)?A. Seattle, WA B. Springfield, IL C. Phoenix, AZ D. New York, NY
1 Answer
If you were to drill a hole into the wooden sphere, and fill it with lead, how much of the volume of the wood would have to be replaced to make the whole sphere neutrally buoyant (i.e. have the same density as water)?
2 Answers