The skin temperature of a person is 34o C and his body surface area is about 1.8 m2 . He is standing bare skin in a room where the air temperature is 24o C and the walls are 17o C. He is metabolizing food at a rate of 155 W, the emissivity of his skin is 0.97 and there is a 5mm thick dead layer (immobile) air next to his skin acting as an insulation. a./ at what rate his body is losing heat by conduction

Answer:

6.67A

Explanation:

The voltage across the capacitor formula is expressed as;

VL = IXL

VL is the voltage across the capacitor = 240volts (since it is a parallel connection, all the elements will have the same voltage)

I is the capacitor current

XL is the capacitive reactance = 36 ohms

Recall from the formula:

VL = IXL

I = VL/XL

I = 240/36

I = 6.67A

Hence the capacitor current is 6.67A

Answer:

the simplified expression is written as 3.4 x 10³

Explanation:

Given expression;

[tex]\frac{34000\times 0.4}{0.02 \times 200}[/tex]

in scientific notation, the expression is simplified as;

[tex]\frac{34000\times 0.4}{0.02 \times 200} = \frac{13600}{4} = 3400 = 3.4 \times 10^3[/tex]

Therefore, in scientific notation, the simplified expression is written as 3.4 x 10³

Answer:

a) phere A has 8 negative charges and sphere B has 2 positive charges

b)  each one has then 3 negative charges

Explanation:

In this case, it is asked to determine the charge of the spheres in two conditions

a) Before connecting the cable, sphere A has 8 negative charges and sphere B has 2 positive charges

b) After connecting the cable, as the spheres are metallic, the load is distributed, we have

              q = 8 -2 = 6 negative charges

these charges are distributed between the two spheres, each one has then 3 negative charges

Answer:

Double helix

Explanation:

The Double helix is a DNA molecule. The two strands around the Double Helix is called the twisted ladder.

Answer:

double helix

Explanation:

Answer:

D, 1J

Explanation:

PE=1/2kx^2 and plug in the variables.

PE=1/2 x 200 x 0.1^2= 1J

Answer:

900 lb to the right

Explanation:

Newton's third law of motion states that for every action there is equal and opposite reaction.

Hence if the two cars (i.e. car A and car B) crash head on and there is an impact on car A of 900 lb to the left, car B would have to generate a force of equal magnitude and in an opposite direction. Since car A had a force of 900 lb to the left, the impact force exerted on car B would be 900 lb to the right.

The answer is 900 lb to the right

metal and hair I think hope this helps

Answer:

cars and trains

Explanation:

i hope that good

Answer:

A.) armand probably looked at the graph that the liquid sensor sends information too

Explanation:

Answer:

Explanation:

a ) Between r = 0 and r = r₁

Electric field will be zero . It is so because no charge lies in between r = 0 and r = r₁ .

b ) From r = r₁ to r = r₂

At distance r , charge contained in the sphere of radius r

volume charge density x 4/3 π r³

q = Q x r³ / R³

Applying Gauss's law

4πr² E = q / ε₀

4πr² E = Q x r³ / ε₀R³

E= Q x r / (4πε₀R³)

E ∝ r .

c )

Outside of r = r₂

charge contained in the sphere of radius r = Q

Applying Gauss's law

4πr² E = q / ε₀

4πr² E = Q  / ε₀

E = Q  / 4πε₀r²

E ∝ 1 / r² .

Beam balance is used to determine the mass of an object.

Answer:

Divide then multiply or multiply then divide

Explanation:

to get the answer of a and b

Answer:

1- 4Ω

Explanation:

if 2Ω is 2 meters, than 4 metres is 4Ω

Answer:

K_{e} = 2.0 J

Explanation:

In this exercise you are asked to calculate the elastic potential energy of a spring

          [tex]K_{e}[/tex] = ½ k x²

where k is the spring constant and x is the displacement from equilibrium position

In this exercise, indicate that the spring constant is k = 100 N/m, the length at rest is  x₀ = 20 cm = 0.20 m, up to the position x₁ = 40 cm = 0.40 m, therefore the elongation

           Δx = x₁ - x₀

           Δx = 0.40 - 0.20

           Δx = 0.20 m

let's calculate the elastic potential energy

           K_{e} = ½ 100 0.20²

           K_{e} = 2.0 J

Answer:

The explosive force experienced by the shell inside the barrel is 23437500 newtons.

Explanation:

Let suppose that shells are not experiencing any effect from non-conservative forces (i.e. friction, air viscosity) and changes in gravitational potential energy are negligible. The explosive force experienced by the shell inside the barrel can be estimated by Work-Energy Theorem, represented by the following formula:

[tex]F\cdot \Delta s = \frac{1}{2}\cdot m \cdot (v_{f}^{2}-v_{o}^{2})[/tex] (1)

Where:

[tex]F[/tex] - Explosive force, measured in newtons.

[tex]\Delta s[/tex] - Barrel length, measured in meters.

[tex]m[/tex] - Mass of the shell, measured in kilograms.

[tex]v_{o}[/tex], [tex]v_{f}[/tex] - Initial and final speeds of the shell, measured in meters per second.

If we know that [tex]m = 1250\,kg[/tex], [tex]v_{o} = 0\,\frac{m}{s}[/tex], [tex]v_{f} = 750\,\frac{m}{s}[/tex] and [tex]\Delta s = 15\,m[/tex], then the explosive force experienced by the shell inside the barrel is:

[tex]F = \frac{m\cdot (v_{f}^{2}-v_{o}^{2})}{2\cdot \Delta s}[/tex]

[tex]F = \frac{(1250\,kg)\cdot \left[\left(750\,\frac{m}{s} \right)^{2}-\left(0\,\frac{m}{s} \right)^{2}\right]}{2\cdot (15\,m)}[/tex]

[tex]F = 23437500\,N[/tex]

The explosive force experienced by the shell inside the barrel is 23437500 newtons.

Answer:

    I = 1.06886  N s

Explanation:

The expression for momentum is

          I = F t = Δp

therefore the momentum is a vector quantity, for which we define a reference system parallel to the floor

Let's find the components of the initial velocity

          sin 28.2 = v_y / v

          cos 28.2=  vₓ / v

          v_y = v sin 282

          vₓ = v cos 28.2

          v_y = 42.8 sin 28.2 = 20.225 m / s

          vₓ = 42.8 cos 28.2 = 37.72 m / s

since the ball is heading to the ground, the vertical velocity is negative and the horizontal velocity is positive, it can also be calculated by making

θ = -28.2

         v_y = -20.55 m / s

         v_x = 37.72 m / s

X axis

         Iₓ = Δpₓ = [tex]p_{fx} - p_{ox}[/tex]

since the ball moves in the x-axis without changing the velocity, the change in moment must be zero

         Δpₓ = m [tex]v_{fx}[/tex] - m v₀ₓ = 0

          v_{fx} = v₀ₓ

therefore

          Iₓ = 0

Y axis  

        I_y = Δp_y = p_{fy} -p_{oy}

when the ball reaches the floor its vertical speed is downwards and when it leaves the floor its speed has the same modulus but the direction is upwards

         v_{fy} = - v_{oy}

         Δp_y = 2 m v_{oy}

         Δp_y = 2 0.0260 (20.55)

         [tex]\Delta p_{y}[/tex] = 1.0686 N s

the total impulse is

          I = Iₓ i ^ + I_y j ^

          I = 1.06886  j^ N s

Answer:

Angular momentum of the system is 16221465.4617 kgm²/s

Explanation:

Given that;

length of the side of the triangle L =  82 M

m = 75.0 kg × 100 = 7500 kg

distance of each vertex from center R = L/√3 = 82/√3 = 47.34 m

effective acceleration a = 9.8 / 2 = 4.9 m/s²

we know that; effective acceleration is being provided by centripetal acceleration.

so

a = R × w²

rate of rotation w = √( a / R) = √( 4.9 / 47.34)  = 0.3217 rad/seconds

Moment of Inertia I = 3mR²

we substitute

I = 3 × 7500 × (47.34)²

Also, Angular momentum L is expressed as;

L = I × w

so

L = 3 × 7500 × (47.34)² × 0.3217

L =  16221465.4617 kgm²/s

Therefore, Angular momentum of the system is 16221465.4617 kgm²/s

The Angular momentum of the system is 16221465.4617 kgm²/s

Given that;

Length of the side of the triangle L =  82 M

[tex]m = 75.0 kg \times 100 = 7500 kg[/tex]

Now

distance of each vertex from center R = L/√3

= 82/√3

= 47.34 m

Now

effective acceleration [tex]a = 9.8 \div 2[/tex] = 4.9 m/s²

So,

a = R × w²

Now

rate of rotation [tex]w = \sqrt( a \div R) = \sqrt( 4.9 \div 47.34)[/tex]  = 0.3217 rad/seconds

Moment of Inertia I = 3mR²

Now

[tex]I = 3 \times 7500 \times (47.34)^2[/tex]

Also, Angular momentum L is expressed as;

L = I × w

so

L = 3 × 7500 × (47.34)² × 0.3217

=  16221465.4617 kgm²/s

Learn more: https://brainly.com/question/1979431?referrer=searchResults

Answer: 7

Explanation: 7 is the superior number

A uniform spherical shell of mass M = 11.0 kg and radius R = 0.480 m can rotate about a vertical axis on frictionless bearings (see the figure). A massless cord passes around the equator of the shell, over a pulley of rotational inertia I = 0.160 kg m2 and radius r = 0.110 m, and is attached to a small object of mass m = 1.60 kg. There is no friction on the pulley's axle; the cord does not slip on the pulley. What is the speed of the object when it has fallen a distance 0.700 m after being released from rest? Use energy considerations.

Answer:

D

Explanation:

Hope this helps

Answer:

P = 4[Pa]

Explanation:

Pressure is defined as the relationship between Force over area. So we can use the following equation.

[tex]P=F/A[/tex]

where:

P = pressure [Pa] (units of Pascals)

F = force = 100 [N]

A = area = 25 [m²]

Now replacing:

[tex]P=100/25\\P=4[Pa][/tex]

[tex]\\ \rm\longmapsto P=\dfrac{F}{A}[/tex]

[tex]\\ \rm\longmapsto P=\dfrac{100}{25}[/tex]

[tex]\\ \rm\longmapsto P=4Pa[/tex]

Answer:

[tex]D=99.4665307m \approx 99.5m[/tex]

Explanation:

From the question we are told that

Mass  [tex]m=6kg[/tex]

Velocity of mass  [tex]V_m=16[/tex]

Force of Tunnel  [tex]F_t=8N[/tex]

Length of Tunnel [tex]L_t=1.6[/tex]

Height of frictional incline [tex]H_i=2.9[/tex]

Angle of inclination  [tex]\angle =16 \textdegree[/tex]

Acceleration due to gravity  [tex]g=9.8m/s^2[/tex]

First Frictional surface has a coefficient  [tex]\alpha_1 =0.21\ for\ d_c=1[/tex]

Second Frictional surface has a coefficient [tex]\alpha _2=0.1[/tex]

Generally the initial Kinetic energy is mathematically given by

[tex]K.E=\frac{1}{2}mv^2[/tex]

[tex]K.E=\frac{1}{2}(6)(16)^2[/tex]

[tex]K.E=768[/tex]

Generally the work done by the Tunnel is mathematically given as

[tex]w_t=F_t*d_t[/tex]

[tex]w_t=8*1.6[/tex]

[tex]w_t=12.8J[/tex]

Therefore

[tex]Total energy\ E_t=Initial\ kinetic energy\ K.E*Work done\ by\ tunnel\ W_t[/tex]

[tex]E_t=K.E+E_t\\E_t=768J+12.8J[/tex]

[tex]E_t=780.8J[/tex]

Generally the energy lost while climbing is mathematically given as

[tex]E_c=mgh[/tex]

[tex]E_c=(6)(9.8)(2.9)[/tex]

[tex]E_c=170.52J[/tex]

Generally the energy lost to friction is mathematically given as

[tex]E_f=\alpha *m*g*cos\textdegree*d_c[/tex]

[tex]E_f=0.21*6*9.8*cos16*1[/tex]

[tex]E_f=11.86965942 \approx 12J[/tex]

Generally the energy left in the form of mass [tex]Em[/tex] is mathematically given as

[tex]E_m=E_t+E_c+E_f[/tex]

[tex]E_m=(768J)-(170.52)-(12)[/tex]

[tex]E_m=585.48J[/tex]

Since

[tex]E_m=\alpha_2*g*m*d[/tex]

Therefore

It slide along the second frictional region

[tex]D=\frac{585.46}{0.1*9.81*6}[/tex]

[tex]D=99.4665307m \approx 99.5m[/tex]

Answer:

33.5J

Explanation:

Given:

Mass of the canister= 3.1 kg

Initial velocity of canister= v(i)= 4.4i m/s

Final velocity of canister= v(f)= 6.4j m/s

Force magnitude( xy plane)= 5 N

The magnitude of vector V'= Vxi + Vyj + Vzk

|V|= √( Vx^2 + Vy^2 + Vz^2

From Kinectic energy and work theorem.

Net work = Kinectic energy of the canister

ΔK= W

(Kf - Ki)= W

Where Kf= final Kinectic energy

= 1/2 mv^2

If we input the given values we have,

= 1/2 × 3.1 ×√(4.4^2 + 0^2 + 0^2)^2 = 30J

Ki= initial Kinectic energy

= 1/2 mv^2

If we substitute the given values we have

=1/2 × 3.1 ×√(0^2 + 6.4^2 + 0^2)^2 = 63.5 J

Work done by canister = (final Kinectic energy - initial energy)

= 63.5- 30

=33.5J

Hence, work done on the canister 33.5J

Answer:

A: nucleus

D: neutron

hope this helps :D

Answer:

A: nucleus

D: neutron

Explanation: hope this helps! <3

Answer:

Nitrogen and Oxygen are the two major atmospheric gases.

Answer:

14.8m

Explanation:

Given parameters:

Initial speed  = 17m/s

Unknown:

Maximum height  = ?

Solution:

At the maximum height, the final speed will be 0m/s;

 We use of the kinematics equation to solve this problem.

     V²   = U²   - 2gH

V is the final velocity

U is the initial velocity

g is the acceleration due to gravity

H is the height

         0²   = 17²  -  (2  x 9.8 x h )

          0 = 289  - (9.6h)

         -289  = -19.6h

            h  = 14.8m

“As temperatures drop, the pavement contracts, building up tensile stresses that lead to cracking,” states MnDOT's Research Services Section. “Fractures occur every 20 to 30 feet across the lane, allowing water to penetrate the structure, which further weakens the pavement layer and the base beneath

Answer:

The direction could change

Answer:

1. at the top of the coaster.

2. at the bottom of the coaster.

3. when the car is moving

4. when the car is moving

Explanation:

there is the most amount if potential energy at the top, and the keast at the bottom.