If an atom of Calcium has 21 electrons is it a...?
A) isotope
B) calcium does not have...
Physics, 16.10.2020 17:01 sonaihriley
If an atom of Calcium has 21 electrons is it a...?
A) isotope
B) calcium does not have electrons
C) normal, no charge
D) ion
Answers: 2
Physics, 22.06.2019 01:00
Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created or , but it can be
Answers: 1
Physics, 22.06.2019 04:30
Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.
Answers: 1
Physics, 22.06.2019 08:00
Which notation is used to represent an alpha particle? a. b. c. d.
Answers: 1
Physics, 22.06.2019 16:40
Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".
Answers: 3
History, 26.07.2019 10:00
Biology, 26.07.2019 10:00
History, 26.07.2019 10:00
Biology, 26.07.2019 10:00
History, 26.07.2019 10:00
Mathematics, 26.07.2019 10:00
History, 26.07.2019 10:00
Chemistry, 26.07.2019 10:00
Mathematics, 26.07.2019 10:00