Which of the following is a negatively charged polyatomic ion?

a. Ammonium ion
b. Oxide ion
c. Sodium ion
d. Nitrate ion


d

Physics & Space Science

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Massive stars form cores of ________ before exploding as Type II supernovae

Fill in the blank(s) with correct word

Physics & Space Science

The howler monkey is the loudest land animal and can be heard up to a distance of 9.8 km. Assume the acoustic output of a howler to be uniform in all directions

The distance at which the intensity level of a howler's call is 25 dB, in SI units, is closest to: A) 550 B) 660 C) 830 D) 940 E) 1,100

Physics & Space Science

The position of an object that is oscillating on an ideal spring is given by x = (17.4 cm) cos[(5.46 s-1)t]. Write an expression for the velocity of the particle as a function of time using the sine function

What will be an ideal response?

Physics & Space Science

An artillery shell is fired with an initial velocity of 300 m/s at 55.0° above the horizontal. It explodes on a mountainside 42.0 s after firing. If x is horizontal and y vertical, find the (x, y) coordinates where the shell explodes

Physics & Space Science