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3 years ago

Which one of the following does not accurately describe the universal gravitational law?

Physics

2 answers:

Allisa [31]3 years ago

8 0

Answer:

Gravitational force is proportional to the square of the distance between the centers of both bodies.

Explanation:

Verizon [17]3 years ago

6 0

B. Gravitational force is proportional to the square of the distance between the centers of both bodies.

it's one over the square ... invrse or reciprocal square law

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B. A car moving at an initial speed vi applies its brakes and skids for some distance until coming to a complete stop. If the co

wariber [46]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The distance which the car skid is $l = \frac{v_i^2 }{2 * \mu_k * g }$

Explanation:

From the question we are told that

The initial velocity of the car is $v_i$

The coefficient of kinetic friction is $\mu_k$

According to the law of energy conservation

The initial Mechanical Energy = The final Mechanical Energy

$M_i = M_f$

The initial mechanical energy is mathematically represented as

$M_i = KE _o + PE_e$

where KE is the initial kinetic energy which is mathematically represented as

$KE = \frac{1}{2} m v_i^2$

And PE is the initial potential energy which is zero given that the car is on the ground

Now

$M_f = W_{\mu}$

Where $W_{\mu}$ is the work which friction exerted on the car which is mathematically represented as

$W_{\mu} = m* \mu_k * g * l$

Where $l$ is the distance covered by the car before it slowed down

$\frac{1}{2} m v_i^2 = m* \mu_k * g * l$

=> $l = \frac{v_i^2 }{2 * \mu_k * g }$

3 0

4 years ago

Consider an object on a rotating disk a distance r from its center, held in place on the disk by static friction. Which of the f

SVEN [57.7K]

Answer:

A) False

B) False

C) True

D) True

E) True

Explanation:

A) The formula for tangential speed v in term of angular speed ω and radius of rotation r is

$v = \omega r$

So if the angular speed is constant and 0, the tangential speed is also 0. A) is false

B) False because of the centripetal acceleration:

$a_c = \omega^2 r$

C) True because of the formula for tangential acceleration in term of angular acceleration α is

$a_t = \alpha r$

D) True because same as D), if it has angular acceleration, it would have a tangential acceleration. Also from B) the centripetal acceleration will come with time as soon as angular speed is generated by angular acceleration.

E) True and same explanation as from B)

8 0

3 years ago

A 61.6 turns circular coil with radius 4.44 cm and resistance 2.34 Ω is placed in a magnetic field directed perpendicular to the

Setler [38]

Answer:

Induced emf is 0.324 V

Explanation:

We have,

Number of turns, n = 61.6

Radius of circular coil, r = 4.44 cm

Resistance of coil, R = 2.34 Ω

The magnitude of the magnetic field varies in time according to the expression :

$B=a_1t+a_2t^2$

$a_1=0.0411\\\\a_2=0.044$

The magnitude of the induced emf in the coil is given by :

$\epsilon=\dfrac{d\phi}{dt}\\\\\epsilon=\dfrac{d(NBA)}{dt}\\\\\epsilon=NA\dfrac{dB}{dt}$

$\epsilon=\pi r^2\dfrac{dB}{dt}$

At t = 9.21 s,

$\dfrac{dB}{dt}=(0.0411+2\times 0.044 \times 9.21)\\\\\dfrac{dB}{dt}=0.851\ T/s$

$\epsilon=61.6\times \pi \times (4.44 \times 10^{-2})^2\times 0.851$

$\epsilon=5.27\times 10^{-3}\ V$

So, the magnitude of the induced emf in the coil is 0.324 V

5 0

4 years ago

For a bronze alloy, the stress at which plastic deformation begins is 294 MPa and the modulus of elasticity is 121 GPa. (a) What

FromTheMoon [43]

Answer:

a) load in Newton is 96,138 b) 129.314mm

Explanation:

Stress = force/ area (cross sectional area of the bronze)

Force(load) = 294*10^6*327*10^-6 = 96138N

b) modulus e = stress/ strain

Strain = stress/ e = (294*10^6)/ (121*10^ 9) = 2.34* 10^ -3

Strain = change in length/ original length = DL/ 129

Change in length DL = 129 * 2.34*10^ -3 = 0.31347

Maximum length = change in length + original length = 129.314mm

7 0

3 years ago

What evidence suggests that Earth attracts or pulls on objects?

Contact [7]

Every object in the universe that has mass<span> exerts a gravitational pull, or </span>force<span>, on every other mass. </span>

5 0

4 years ago

Read 2 more answers