Biology Forums - Study Force

When you jump, you accelerate upward because the floor exerts an upward force on you.
  Indicate whether the statement is true or false

---

[Ques. 2] Which of these is a result first obtained by Planck?
 a. That energy is emitted continuously from each atom.
  b. That different materials used to construct the hollow block with a small hole emit different energy spectral distributions.
  c. That energy is emitted in discrete quanta.
  d. That light exists only as photons.
  e. That at high temperatures, electromagnetic radiation is more intense at shorter wavelengths.

---

[Ques. 3] You push on a wall, and the wall pushes back on you with the same force. This is an example of Newton's third law.
  Indicate whether the statement is true or false

---

[Ques. 4] An object with a temperature of 8000 K is brightest in the _________ and an object at 4000 K is brightest in the _________.
 a. infrared/ultraviolet
  b. visible region/infrared
  c. blue range/red range
  d. ultraviolet/green range
  e. ultraviolet/infrared

---

[Ques. 5] To hold a 5 lb bag of sugar in your hand, you must push upwards on it with a force of 5 lb. This is an example of Newton's third law.
  Indicate whether the statement is true or false

---

[Ques. 6] Which of these did Rutherford's solar system model of the atom successfully explain?
 a. Spectral lines.
  b. The periodic properties of the elements.
  c. How atoms could give off light without collapsing.
  d. Why some alpha particles would bounce back when hitting an atom.
  e. Absorption spectra.

---

[Ques. 7] When a body moves in a straight line with increasing speed, the net force on it must be increasing.
  Indicate whether the statement is true or false

---

[Ques. 8] Why are paths of the alpha particles deflected by the nucleus in this figure?
 a. They bounce off each other just like billiard balls do.
  b. Because of the electrostatic repulsion of particles with the same sign of charge.
  c. This is predicted by Thomson's plum pudding model of the nucleus.
  d. Because electrons outside the nucleus are repelling the alpha particle.
  e. Because of the forces holding the protons and neutrons together inside the nucleus.

---

[Ques. 9] A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up and down motion The displacement vector from the equilibrium position points up.
  Indicate whether the statement is true or false

---

[Ques. 10] What is an alpha particle?
 a. A hydrogen atom.
  b. A helium atom.
  c. A hydrogen atom without its electrons (and therefore having one unit of positive charge).
  d. A helium atom without its electrons (and therefore having two units of positive charge).
  e. A deuterium nucleus (with one proton and one neutron).

Content hidden

thank you !