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1 year ago

11

Which of the following are for vector directione?

1 answer:

Inga [223]1 year ago

8 0

Answer:
C. outside 45 degrees
Step-by-step explanation:
C. outside 45 degrees
because it can be any point or direction outside 45 degrees

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Silver has a work function of 4.5 eV . Part A What is the longest wavelength of light that will release an electron from a silve

uranmaximum [27]

Answer:

λ = 2.7608 x 10⁻⁷ m = 276.08 nm

Explanation:

The work function of a metallic surface is the minimum amount of photon energy required to release the photo-electrons from the surface of metal. The work function is given by the following formula:

Work Function = hc/λ

where,

Work Function = (4.5 eV)(1.6 x 10⁻¹⁹ J/1 eV) = 7.2 x 10⁻¹⁹ J

h = Plank's Constant = 6.626 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s

λ = longest wavelength capable of releasing electron.

Therefore,

7.2 x 10⁻¹⁹ J = (6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/λ

λ = (6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/(7.2 x 10⁻¹⁹ J)

<u>λ = 2.7608 x 10⁻⁷ m = 276.08 nm</u>

7 0

2 years ago

Bullets spin when shot from a rifle or handgun. What causes this spinning?

tamaranim1 [39]

Answer:

The spark from the primer ignites the gunpowder. Gas converted from the burning powder rapidly expands in the cartridge. The expanding gas forces the bullet out of the cartridge and down the barrel with great speed. The rifling in the barrel causes the bullet to spin as it travels out of the barrel.

Explanation:

7 0

1 year ago

An insect meanders across a sidewalk. The insect moves 15cm to the right, 10cm up the sidewalk and 8cm to the left. What is the

IRISSAK [1]

Answer:12.206 cm, $\theta =54.99^{\circ}$

Explanation:

Given

Insect walks 15 cm to the right

so its position vector is $r_1=15i$

Now it moves 10 cm up so its new position vector

$r_2=15i+10j$

Now it moves 8 cm left so its final position vector is

$r_3=15\hat{i}+10\hat{j}-8\hat{i}=7\hat{i}+10\hat{j}$

so its displacement is given by

$|r_3|=\sqrt{7^2+10^2}=\sqrt{149}=12.206 cm$

For direction, let \theta is the angle made by its position vector with x axis

$tan\theta =\frac{10}{7}=1.428$

$\theta =54.99^{\circ}$

8 0

2 years ago

If the current direction is reversed in one of the strips, the magnetic field in a point A located outside the space between the

serious [3.7K]

Answer:

Twice the initial value

Explanation:

Let the current be = I

the width of the conducting strips be = a

We know that magnetic field between two plates is given by

$B=\frac{\mu_0 I}{2\pi r}$

If the direction of this magnetic field is same between the two plates, then

$B=\frac{\mu_0 I}{2\pi r} - \frac{\mu_0 I}{2\pi r}$

= 0

And when the currents runs opposite at each plate, then

$B=\frac{\mu_0 I}{2\pi r} + \frac{\mu_0 I}{2\pi r}$

$2 \times B_{initial}$

Hence the magnetic field will be twice the initial value of the magnetic field that runs between the plates.

6 0

2 years ago

What will be the change in momentum caused by a net force of 120N acting on an object for 2 seconds?

In-s [12.5K]

Answer:

240 Ns

Explanation:

The momentum of an object is the product of its mass and its velocity:

$p=mv$

where m is the mass of the object and v its velocity.

According to Newton's second Law of motion, the change in momentum of an object is related to the force applied by it by the equation:

$F=\frac{\Delta p}{\Delta t}$

where

F is the force exerted on the object

$\Delta p$ is the change in momentum

$\Delta t$ is the time elapsed

In this problem:

F = 120 N is the force exerted on the object

$\Delta t=2 s$ is the time elapsed

Therefore, the change in momentum of the object is:

$\Delta p=F\Delta t=(120)(2)=240 Ns$

7 0

2 years ago