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3 years ago

Which is thought to be most responsible for Earth's ice ages?

Physics

2 answers:

gulaghasi [49]3 years ago

8 0

Answer: The answer is B. Earth's Precession

Gre4nikov [31]3 years ago

7 0

earths precession so its B

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True or false: The maximum tensile force a solid, cylindrical wire can withstand increases as the thickness of the wire increase

MaRussiya [10]

Answer:

True

Explanation:

The tensile stress, σ, on a solid cylindrical wire is given by the following relationship;

$\sigma = \dfrac{F_t}{A_o}$

Where;

$F_t$ = The tensile force

$A_o$ = The original cross sectional area of the cylindrical wire = π·R²

R = The radius of the wire

Therefore;

$F_t$ = σ × $A_o$ = σ × π × R²

Therefore, the tensile force is directly proportional to the square of the radius of the cylindrical wire, and as the radius of the wire increases, which is by increasing the thickness of the wire, the tensile force is largely increased

The correct option is; True.

7 0

3 years ago

Two identical vertical springs S1 and S2 have masses m1 = 400 g and m2 = 800 g attached to them. If m1 causes spring S1 to stret

OlgaM077 [116]

Answer:

potential energy = mgh

= 400÷1000 × 10× 4÷100

= 0.4 × 10 × 0.04

=4/10 ×10×4/100

= 4/10 × 4/10

=16/100

= 0.16 joules

m1 (400) stretches 4cm

m1 (100g) stretches 1cm

so, m2(800g) stretches 8 cm

potential energy of m2 = mgh

= 800/1000 ×10×8/100

= 0.8 × 0.8

=8/10 ×8/10

= 64/100

=0.64 joules

Ratio of s1 to s2

16/100 ÷ 64/100

= 1:4 ( answer)

6 0

3 years ago

on earth a block is placed on a frictionless table. When a 50 North horizontal force is applied to the block, it accelerates at

melamori03 [73]

As per Newton's II law we know that

$F = ma$

here

F = applied unbalanced force

m = mass of object

a = acceleration of object

now it is given that force F = 50 N North applied on block on earth due to which block will accelerate by 4 m/s^2

so here from above equation

$50 = m* 4$

$m = \frac{50}{4} = 12.5 kg$

Now we took another situation where block is placed on surface of moon and again force F = 25 N is applied on the block

So we will again use Newton's II law

$F = ma$

$25 = 12.5 * a$

$a = \frac{25}{12.5}$

$a = 2 m/s^2$

so block will accelerate on moon by acceleration 2 m/s^2

5 0

3 years ago

If the electric intensity between two parallel plates, placed 1cm apart is 104 NC-1and the direction of the field of this intens

ankoles [38]

The force of a charge in an electric field is:

$\vec{F}_e=q\vec{E}$

In this case we know the electric field is:

$\vec{E}=104\hat{j}$

and that the charge is that of the electron, then we have:

$\begin{gathered} \vec{F}_e=-1.6\times10^{-19}(104\hat{j}) \\ \vec{F}_e=-1.664\times10^{-17}\text{ N} \end{gathered}$

Therefore, the magnitude of the force is

$1.664\times10^{-17}\text{ N}$

and in points down.

The weight of the electron is:

$\begin{gathered} W=1.67\times10^{-27}(9.98) \\ W=1.6366\times10^{-26} \end{gathered}$

Making the quotient between the force we have:

$\frac{1.664\times10^{-17}}{1.6366\times10^{-26}}=1.02\times10^9$

Therefore, the electric force is approximately 1e9 times the weight.

3 0

2 years ago

The energy an object has because of its position is called _____

Alenkinab [10]

Answer:

Gravitational potential energy

Explanation:

The gravitational potential energy is the energy that an object has because of its positive with respect to a certain reference level (generally assumed to be the ground level).

The magnitude of the gravitational potential energy is given by

$U=mgh$

where

m is the mass of the object

g is the strenght of the gravitational field

h is the height of the object with respect to the reference level

From the formula, we see that the higher the object is, the larger its gravitational potential energy is.

5 0

3 years ago