53.0N
21.0N
7.0N
5.0N
Correct answer is D
Vertical resultant = 10 - 6 = 4N
Horizontal resultant = 20 - 17 = 3N
R = \(\sqrt{3^2 + 4^2}\)
= 5N
2.4ms-2
5.6ms-2
8.0ms-2
2.4ms2
Correct answer is B
F + Ma = P
a = \(\frac{P - F}{m}\)
= \(\frac{40 - 12}{5} = 5.6ms^{-2}\)
Which of the following phenomena supports the theory that waves have a particle nature?
electron diffraction
photoelectric effect
diffraction of light
x-ray interference
Correct answer is B
The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. Electrons emitted in this manner are called photoelectrons.
Which of the following statements about the use of radioisotopes is not correct? They are used to
induce mutations in plants and animals to obtain new and improved varieties
trace the paths of metabolic processes in plants and animals
estimate the age of rocks
locate broken bones
Correct answer is A
No explanation has been provided for this answer.
Which of the following particles are termed nucleons in a neutral atom?
protons and neutrons
neutrons and electrons
protons and electrons
protons, electrons and neutrons
Correct answer is A
No explanation has been provided for this answer.
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