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kari74 [83]
3 years ago
11

Select all that apply. A vector always consists of _____. size velocity distance direction

Physics
2 answers:
pashok25 [27]3 years ago
5 0

<em>The  answer is Size and Direction</em>


Ahat [919]3 years ago
4 0
The correct answer is C) size and D) direction
Vector quantities possess both size and direction while scalars possess only size. Hope this helps.
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A sample contains radioactive atoms of two types, A and B. Initially there are five times as many A atoms as there are B atoms.
victus00 [196]

Answer:

Explanation:

Initially no of atoms of A = N₀(A)

Initially no of atoms of B = N₀(B)

5 X N₀(A)  = N₀(B)

N = N₀ e^{-\lambda t}

N is no of atoms after time t , λ is decay constant and t is time .

For A

N(A) = N(A)₀ e^{-\lambda_1 t}

For B

N(B) = N(B)₀ e^{-\lambda_2 t}

N(A) = N(B) , for t = 2 h

N(A)₀ e^{-\lambda_1 t} = N(B)₀ e^{-\lambda_2 t}

N(A)₀ e^{-\lambda_1 t} = 5 x N₀(A)  e^{-\lambda_2 t}

e^{-\lambda_1 t} = 5  e^{-\lambda_2 t}

e^{\lambda_2 t} = 5  e^{\lambda_1 t}

half life = .693 / λ

For A

.77 =  .693 / λ₁

λ₁ = .9 h⁻¹

e^{\lambda_2 t} = 5  e^{\lambda_1 t}

Putting t = 2 h , λ₁ = .9 h⁻¹

e^{\lambda_2\times  2} = 5  e^{.9\times  2}

e^{\lambda_2\times  2} = 30.25

2 x λ₂ = 3.41

λ₂ = 1.7047

Half life of B = .693 / 1.7047

= .4065 hours .

= .41 hours .

6 0
3 years ago
A wheel of radius R = 0.80 m is pulled by a rope looped around a frictionless axle. The total mass of the wheel and axle assembl
iragen [17]

Answer:

\frac{K_T}{K_R}=\frac{600J}{188.63J}=3.18

Explanation:

To find the rotational kinetic energy you first calculate the angular acceleration by using the following formula:

\tau=I\alpha\\\\FR=I\alpha\\\\\alpha=\frac{FR}{I}

F: force applied

R: radius of the wheel

I: moment of inertia

\alpha=\frac{(120N)(0.80m)}{26.88kgm^2}=3.57\frac{rad}{s^2}

With this value you calculate the angular velocity:

\omega^2=\omega_o^2+2\alpha \theta\\

you calculate how many radians the wheel run in 5.0m

\theta=\frac{2\pi (0.8m)}{5.0m}=\approx1.00rad

\omega=\sqrt{2(3.57\frac{rad}{s^2})(1.00rad)}=2.67\frac{rad}{s}

Next, you use the formula for the rotational kinetic energy:

K_R=\frac{1}{2}I\omega^2=(26.88)(2.67)^2 J = 188.63J

For the transnational kinetic energy you use the following equation:

W=\Delta K_T  (net work equals the change in the kinetic energy).

By replacing the you obtain:

\Delta K_T=Fd=(120)(5.0)J=600J

Finally, the ratio between translational rotational kinetic energy is:

\frac{K_T}{K_R}=\frac{600J}{188.63J}=3.18

hence, translational kinetic energy is three times the rotational kinetic energy.

6 0
3 years ago
A 60 kg student is standing atop a spring in an elevator that is accelerating upward at 3.0 m/s2. The spring constant is 2.5 x 1
dimaraw [331]

the spring will be compressed by 0.3072 m

Explanation:

acceleration of elevator=3 m/s²

mass of student= 60 Kg

spring constant=2.5 x 10³ N/m

the force on the student is given by F = m ( g +a)

F=60 (9.8+3)

F=768 N

now the formula for spring force is given by

F= k x

768= 2.5 x 10³ (x)

x=0.3072 m

6 0
3 years ago
Can some help me pliz ​
muminat

1).  a

2).  g

3).  b

4).  h

5).  e

6).  c

7).  d

8).  f

3 0
4 years ago
If a car changes its velocity from 32km/hr in 8.0 seconds what is its acceleration
puteri [66]

We don't know the change in velocity, so can't answer.

3 0
3 years ago
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