3 years ago

True or false elliptical galaxies are made up of old stars containing small amount of gas

Physics

1 answer:

ch4aika [34]3 years ago

6 0

True, They contain old stars and posses little gas or dust

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There is a bell at the top of a tower that is 45 m high. The bell weighs 190 N. The bell has ____________

salantis [7]

Answer:

The bell has a potential energy of 8550 [J]

Explanation:

Since the belt is 45 [m] above ground level, only potential energy is available. And this energy can be calculated by means of the following equation.

$E_{p}= W*h\\E_{p} = 190*45\\E_{p}=8550[J]$

8 0

3 years ago

In free fall the object with less air resistance falls with a greater acceleration

ANEK [815]

terminal velocity ... greater speed ... acc is 10m/s/s

5 0

4 years ago

A particle moves along a straight line. Its position at any instant is given by x = 32t− 38t^3/3 where x is in metre and t in se

Rudik [331]

Answer:

The acceleration of the object is -69.78 m/s²

Explanation:

Given;

postion of the particle:

$x = 32t - 38\frac{t^3}{3} \\\\$

The velocity of the particle is calculated as the change in the position of the particle with time;

$v = \frac{dx}{dt} = 32 - 38t^2\\\\when \ the \ particle \ is \ at \ rest, \ v = 0\\\\32-38t^2 = 0\\\\38t^2 = 32\\\\t^2 = \frac{32}{38} \\\\t = \sqrt{\frac{32}{38} } \\\\t = 0.918 \ s$