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3 years ago

Which property of the isotopes must be different

Physics

2 answers:

Dmitriy789 [7]3 years ago

5 0

Answer:

Explanation:

chemical properties of isotopes are different . but their valencies are same so the gain or lose electrons the same

Afina-wow [57]3 years ago

4 0

Answer:

physical properties

Explanation:

Isotopes have the same number of electrons as an atom of that element. Because of that they have similar chemical properties. However they have different numbers of neutrons, which affects the mass number. Mass number determines the physical properties such as boiling/melting/density etc. Therefore, the physical properties of the isotopes must be different.

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A student catches a can of soda dropped from some unknown height by Mr. Fineman. If

nikdorinn [45]

Answer:

v² = u² + 2gh

8.9² = 0² + 2(9.8)h

h = 4.0 m

v = at

t = 8.9/9.8

t = 0.91 s

3 0

2 years ago

A free-falling projectile is launched from the ground and has a hangtime of 6 seconds before hitting the ground. How high did it

grandymaker [24]

1A)

x=v0x*t=v0cosθ*t

x=52co31*3.2=142.6 m

1B)

y0=1/2gt^2-v0y*t=1/2gt^2-v0sinθt

y=0.5*9.8*3.2^2-52*sin31*3,2=23.4 m

2A)

x=2v0^2sin(2θ)/g

v0=[xg/2sin(2θ)]^1/2=14.4 m/s

the initial speed relative to the ground is

v=v0-4.4=10 m/s

2B)

fly time is

t=2voy/g

t=2*14.4/9.8=2.94

2C)

mgy=1/2mv0y^2

y=v0y^2/(2g)=10.58 m

7 0

3 years ago

Two equal-mass pieces of metal are sitting side by side at the bottom of a deep lake. One piece is aluminum and the other is lea

murzikaleks [220]

Answer:

A. Aluminium

Explanation:

Buoyant force is simple terms refers to the weight of water displaced when an object is immersed in it. The higher the volume of an object, the higher the buoyant force.

From the problem, we have two metals of equal mass, aluminium and lead, of which lead is denser.

density = $\frac{mass}{volume}$

Volume = $\frac{mass}{density}$

This means that the volume of each metal depends on the density, and for the fact that lead is denser , it will have a lower volume than aluminium which means Aluminium will have a greater buoyant force.

5 0

4 years ago

Two frisky grasshoppers collide in midair at the top of their respective trajectories and grab onto each other, holding tight th

Svetlanka [38]

Answer:

The decrease in Kinetic energy is 0.0107 Joules

Explanation:

Given

Mass of grasshoppers

Let m1 = Mass of grasshopper 1

Let m2 = Mass of grasshopper 2

Let u1 = initial speed of grasshopper 1

Let u2 = initial speed of grasshopper 2

m1 = 250g = 0.25kg

m2 = 130g = 0.13kg

u1 = 15cm/s = 0.15m/s

u2 = 65cm/s = 0.65m/s

First, we calculate the final velocity of the grasshoppers after collision using conservation of momentum.

Using

m1u1 + m2u2 = (m1 + m2) * v

Where v = final velocity

By substituton

0.25 * 0.15 + 0.13 * 0.65 = (0.25 + 0.13) * v

0.0375 + 0.0845 = 380v

0.122 = 0.38v

Make v the subject of formula

v = 0.122/0.38

v = 0.321 m/s

Calculating the Kinetic energies before and after impact.

Before collision;

KE = ½m1u1²+ ½m2u2²

KE = ½(m1u1² + m2u2²)

By substituton;

KE = ½(0.25 * 0.15² + 0.13 * 0.65²)

KE = 0.030275J

After collision:

KE = ½(m1+m2)v²

KE = ½(0.25 + 0.13) * 0.321²

KE = 0.01957779 J

Change in kinetic energy = ∆KE

∆KE = 0.030275J - 0.01957779J

∆KE = 0.01069721J

∆KE = 0.0107 J --- Approximately

Hence the decrease in Kinetic energy is 0.0107 Joules

7 0

3 years ago

Which Law is connected with inertia?

Ilya [14]

Newton's first law of motion is connected with inertia :)

6 0

3 years ago

Read 2 more answers