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3 years ago

Select the correct answer. What was the main objective of the Discovery missions?

Physics

1 answer:

Nimfa-mama [501]3 years ago

6 0

Answer:

Explanation:

exploration surrounding our universe will give us a better understanding of it.

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A certain lightbulb has a tungsten filament with a resistance of 20.3 Ω when at 20.0°C and 135 Ω when hot. Assume the resistivit

Paladinen [302]

Answer:

1275.61° C

Explanation:

The resistance of a conductor varies as a function of temperature and it is given as follows

$R= R_o[1+\alpha(T-T_0)]$

R_0 is the resistance at temperature T_0, R is the resistance at T and α is the coefficient of temperature of resistance

α= 0.0045/°C

R_0 = 20.3Ω T_0 = 20°C and R= 135Ω

$135= 20.3[1+0.0045(T-20)]$

T= 1275.61° C

Therefore the temperature of the hot filament = 1275.61° C

3 0

3 years ago

A car moving 20 m/s accelerates at 3 m/s for 5 seconds. what is the final velocity?

Yuliya22 [10]

The final velocity is of the car is 35 $ms^{-1}$ .

<u>Explanation:</u>

The car initially moves in the velocity 20 $ms^{-1}$ . It then accelerated by 3 $ms^{-2}$ for 5 seconds.

The formula to find final velocity, $v_f=v_i+a(t).$

$v_i$ : initial velocity of the car.

a: acceleration rate.

t: time.

$v_f$ : final velocity

From the given information,

$v_i$ = 20 $ms^{-1}$ .

a=3 $ms^{-2}$ .

t= 5s.

$v_f$ =20+3(5).

=20+15.

=35 $ms^{-1}$ .

∴The final velocity of the moving car is 35 $ms^{-1}$ .

3 0

3 years ago

During the power stroke energy released by combustion generates the force that:_______.

Inessa05 [86]

Explanation:

An IC engines means an Internal Combustion engine. Here, the combustion takes place in side a chamber or a cylinder internally, hence it is known as internal combustion engine.

Combustion is the process where oxygen reacts with the fuel and it burns to produce a large amount of force and heat. In each revolution of the crank, the engine creates a power stroke when the piston goes from the bottom dead center to the top dead center.

During each power stroke, the energy released forces the piston down and the crankshaft is rotated.

8 0

3 years ago

An electron moving with a speed of 4.0 * 105 m>s in the positive x direction experiences zero magnetic force. When it moves i

IgorLugansk [536]

Answer:

Explanation:

Given that,

Charge on an electron is

q=1.609×10^-19C

Speed of electron V=4×10^5 m/s in positive x direction

V = 4×10^5 •i m/s

At this point F=0N

When the electron is moving in positive y direction

V =4×10^5 •j m/s

F = 3.2×10^-13 N in positive z direction.

F = 3.2×10 ^-13 •k N

What is the direction and magnitude of the magnetic field B?

The force in a magnetic field is given as

F = q (V ×B)

The only time V×B is zero is when both V and B are in same direction

This shows that B is in the positive x direction or negative x direction

i.e B= Bx •i

Now applying this to the second condition

F= q(V×B)

3.2×10^-13 •k =1.609×10^-19 × (4×10^5•j ×Bx •i)

Note that, j×i =-k

3.2×10^-13 •k / 1.609×10^-19 = (4×10^5Bx •(j×i))

1988812.927 •k =- 4×10^5Bx•k

1988812.927/4×10^5 •k =-Bx •k

4.972 •k =-Bx •k

Then, Bx = -4.972 •k Telsa

Then, the magnitude of B is

B=4.972 T

And its direction is negative z direction.

4 0

2 years ago

Read 2 more answers

A piece of aluminium foil is held between a bar magnet and a paperclip. What will happen to the paper clip?

Nuetrik [128]

Answer:the paper clip will be attracted to the magnet

Explanation:

7 0

2 years ago