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Physics
Physics
High School
What is the speed of a jet plane that flies 7200 km in 9 hours (in km/hr)?
Physics
High School
Changes in forms of energy are called energy?
Physics
High School
The magnetic field lines outside a bar magneta originate from the South poll and end at itsnorth poleb) originate from the north pole and end atits east polec) Orginate from the south pole and end at itswest poled) origenate from the north pole and ent at itssouth pole
Physics
High School
A ball is dropped off the side of a bridge.After 1.55 s, how far has it fallen?
Physics
High School
A school bus travels 50 km/hr for 0.75 hr. How far did the bus go?
Physics
College
Three runners are competing in a 120-m race. Each begins when the starting signal sounds and all three runners cross the finish line at the same time. The first runner moves at a constant speed of 6 m/s. The second runner sprints at a constant speed of 7.5 m/s, stops after 60 m to rest for 4 s, then runs the second half of the race at a constant speed of 7.5 m/s. The third runner dashes 60 m at a constant speed of 12 m/s but realizes they forgot their keys, so runs back to the starting line at a constant speed of 12 m/s, then turns around and runs straight to the finish line at a constant speed of 12 m/s. Which of the following statements about this situation is NOT true?Assume all average velocities and average speeds are for the period from the starting signal to the moment the runners cross the finish line. You may select more than one option. a. The average speed of the third runner is not equal to his average velocity b. The average velocity of the third runner is zero. c. The first runner's average velocity is equal to the second runner's average velocity d. The second runner's average speed is less than 7.5 m/s. e. All three runners have the same average velocity.
Physics
High School
PLEASE ANSWER AS QUICK AS POSSIBLE ANSWER WORTH 20 POINTSA materials density is the same, no matter how large or small the sample is, or what its shape is, as long as it is a solid, uniform piece of the material. Explain how this is possible and give an example.
Physics
College
Difference between gravity and weight
Physics
High School
Why is the force of gravity on your body weaker on the Moon than on the Earth?
Physics
High School
A frog jumps vertically upward from a 20m tall building with an initial velocity of 8.1m/s. How high above the ground will the frog reach?
Physics
College
One strategy in a snowball fight is to throw a snowball at a high angle over level ground. While your opponent is watching this first snowball, you throw a second one at a low angle timed to arrive before or at the same time as the first one. Assume both snowballs are thrown with a speed of 34.8 m/s. The first one is thrown at an angle of 70 with respect to the horizontal.At what angle should the second snowball be thrown to arrive at the same point as the first?Answer in units of degrees
Physics
High School
which two explanations are based on personal beliefs
Physics
College
Assume that the wavelengths of photosynthetically active radiations (PAR) are uniformly distributed at integer nanometers in the red spectrum rom 675 to 700 nm. 1. What is the mean of the wavelength distribution for this radiation? 2. What is the variance of the wavelength distribution for this radiation? 3. If instead, the wavelengths are uniformly distributed at integer nanometers from 75 to 100 nanometers, how do the mean and variance of the wavelength distribution compare to the original distribution? Briefly explain.
Physics
College
Define kinetic energy and thermal energy.
Physics
College
Which of the following occurs when a liquids thermal energy is increased?A. The particles break away from one another.B. The particles give off energy.C. The particles slow down.D. The particles move closer together.
Physics
High School
11. A bicycle with an initial velocity of +6 m/s accelerates at a rate of +2 m/s2 for 3seconds. What distance does the bicycle travel during this time?C 18 m9 m27 m36 m
Physics
High School
What is the speed of a jet plane that flies 7200 km in 9 hours (in km/hr)?
Physics
High School
MICROWAVEWhat form of electromagnetic radiation does it use?Describe the frequency and wavelength range of this type of electromagnetic wave.Using the information above and details from your research, write a paragraph of five sentences or more explaining how the device uses the behavior and characteristics of the electromagnetic wave to function. Remember the writing tips from the lesson, and use facts and details to explain your topic sentence.You must include citations for all reliable sources used. Include citations from three or more reliable sources.
Physics
College
What best explains the results of the experiment?In a lab, two identical lab carts (m = 1.0 kg) travel towardeach other, each with a speed of 2 m/s. The cars collide,and one cart moves to the right with a speed of 3 m/sand the other moves left with a speed of 2 m/s.O This experiment did not occur in a closed system.This proves the conservation of momentum sincePAPAO An additional mass was added to one cart, whichexplains the increase in speed.O The increase in speed was due to the kinetic energyfrom one cart transferring to the other.Mark this and returnSave and ExitNextSubmit
Physics
High School
Which of the following numbers with units represents a velocity of an object?W30 m/s EastO aOh30 m East30 m30 m/s
Physics
High School
What force is responsible for the increase in potential energy of an object placed higher in the Earths atmosphere? A. Electric ForceB. Frictional forceC. Spring forceD. Gravitational force
Physics
High School
How, if at all, would the equations written in Parts C and E change if the projectile was thrown from the cliff at an angle above the horizontal? Explain your answer.
Physics
College
Two cars are traveling at the same constant speed v. Car A is moving along a straight section of the road, while B is rounding a circular turn. Which statement is true about the acceleration of the cars? The acceleration of both cars is zero, since they are traveling at a constant speed. Car A is accelerating, but car B is not accelerating. Car A is not accelerating, but car B is accelerating. Both cars are accelerating.
Physics
High School
Hi, Solve for E=hc/
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