HRS - Ask. Learn. Share Knowledge. Logo

Questions in physics

[Done] Which defines the average kinetic energy of a system's particles? A. density B. pressure C. temperature D. volume

[Done] The chart shows the movement of a ball after several seconds. \begin{tabular}{|c|c|} \hline A & B \\ \hline 0 & 0 \\ \hline 4 & 2.5 \\ \hline 8 & 6 \\ \hline 12 & 8 \\ \hline 16 & 10.5 \\ \hline \end{tabular} Column $A$ is on the $x$-axis, and Column $B$ is on the $y$ axis. Which titles should replace $A$ and $B$? A. Column A should be "Time," and Column B should be "Position." B. Column A should be "Position," and Column B should be "Time." C. Column A should be "Velocity," and Column B should be "Speed." D. Column A should be "Speed," and Column B should be "Velocity."

[Done] The information in the table represents the effect of the mass of two objects on the gravitational force between the two objects. | Mass of Object 1 (kg) | Mass of Object 2 (kg) | Distance between Objects 1 and 2 (m) | Gravitational Force between Objects 1 and 2 (N) | |---|---|---|---| | 1 | 1 | 1 | 4 | | 2 | 1 | 1 | ? | Which number should be in the cell with the question mark? A. The number is two because when you double the mass of one of the objects, the force between the objects is halved. B. The number is four because when you double the mass of one of the objects, the force between the objects remains the same. C. The number is eight because when you double the mass of one of the objects, the force between the objects also doubles. D. The number is sixteen because when you double the mass of one of the objects, the force between the objects increases by a factor of 4.

[Done] Which statement is true according to Newton's second law of motion? A. An object accelerates in the direction opposite to the direction of the force applied. B. An object accelerates in the direction perpendicular to the direction of the force applied. C. An object accelerates in the same direction as that of the force applied. D. An object undergoes no acceleration on the application of force. E. An object's acceleration is independent to the force applied.

[Done] TEL: 08029769172 THIRD TERM EXAMINATION 2024/2025 ACADEMIC YEAR Physics(SS2) 1. If the angle of reflection of a propagated ray is 35°, calculate (a) The angle of deviation (b) The angle of glance (c) Angle of incidence. 2. An object is placed between two mirrors inclined at an angle 40 to each other. Find the number of images that will be formed. 3. Which of the following statements is untrue? When an image is formed in a plane mirror, the image formed will be (a) the same size as the object (b) smaller than the object (c) laterally inverted (d) always virtual 4. In which of the following instrument is the image that is formed erect pin hole camera (b) simple camera (c) microscope (d) periscope 5. A body that produces its own light is said to be (a) luminous (b)non- incandescent (c) opaque (d) translucent

[Done] Which statement BEST describes a nuclear fusion reaction? Mass and Elements Produced by Stars Information in the chart shown below suggests a relationship between the mass of a star and the elements that can be produced by a star. Examples of Elements Produced Low-Mass Star High-Mass Star helium helium lithium lithium carbon carbon nitrogen oxygen sodium magnesium silicon iron A. The total number of protons and neutrons is conserved. B. The amount of matter is conserved. C. The total number of atoms is conserved. D. The total number of electrons and neutrons is conserved.

[Done] Select the correct answer. If the frequency of a FM wave is [tex]$8.85 \times 10^7$[/tex] hertz, what is the period of the FM wave? A. [tex]$2.58 \times 10^{-8}$[/tex] seconds B. [tex]$1.13 \times 10^{-8}$[/tex] seconds C. [tex]$1.25 \times 10^{-7}$[/tex] seconds D. [tex]$5.82 \times 10^{-7}$[/tex] seconds

[Done] At the centre of our galaxy there is a supermassive black hole. Its mass is estimated to be 8.57 × 1036 kg. a) If you converted this number to an ordinary number, how many digits would it have? b) Give two reasons why standard index form is useful when working with large numbers like this one.

[Done] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Done] You have three small balls. Balls 1 and 2 attract each other and balls 2 and 3 repel each other. Can any of the balls be neutral? If so, which ones?