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2 years ago

Someone please help me

Physics

1 answer:

xz_007 [3.2K]2 years ago

4 0

The first one is B. I think and the second one is A.

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Over 4 seconds, a car's momentum decreases by 1000 kg m/s how much force did it take to make this happen?

kotykmax [81]

Answer:

250N

Explanation:

Given parameters:

Time = 4s

Momentum = 1000kgm/s

Unknown:

Force = ?

Solution:

To solve this problem, we use Newton's second law of motion;

Ft = Momentum

F is the force

t is the time

So;

F x 4 = 1000kgm/s

F = 250N

6 0

2 years ago

The info below shows three kettles with their powers and the time they take to boil 500cm3 of water. If electricity costs 9p per

Hitman42 [59]

The cost of boiling 500cm3 of water using the 3kW kettle is 1.35 P.

<h3>Cost of electricity for 3 kW kettle</h3>

The cost is calculated as follows;

1 unit = 9p /kWh

Total energy consumed by 3 kW kettle, E = P x t

where;

P is power (kW)
t is time in (hr)

E = 3 kW x (3 mins/60 mins/hr)

E = 0.15 kWh

Energy cost = 9 p/kWh x 0.15 kWh = 1.35 P

Thus, the cost of boiling 500cm3 of water using the 3kW kettle is 1.35 P.

Learn more about energy cost here: brainly.com/question/13795167

#SPJ1

5 0

1 year ago

A tow truck exerts a net force of 1000 N on a 600 kilogram car What’s the cars acceleration

Mice21 [21]

Answer:

a = 1000/600= 5/3 m/s^2

5 0

3 years ago

A magnetic field is uniform over a flat, horizontal circular region with a radius of 2.00 mm, and the field varies with time. In

Shkiper50 [21]

Answer:

0.00016391 V

0.00038665 V

Explanation:

r = Radius = 2 mm

$B_i$ = Initial magnetic field = 0

$B_f$ = Final magnetic field = 1.5 T

t = Time taken = 115 ms

Induced emf is given by

$\varepsilon=\frac{d\phi}{dt}\\\Rightarrow \varepsilon=\frac{A(B_f-B_i)}{dt}\\\Rightarrow \varepsilon=\frac{\pi 0.002^2(1.5)}{0.115}\\\Rightarrow \varepsilon=0.00016391\ V$

The magnitude of the induced emf is 0.00016391 V

$B_i=+1.5\ T$

$B_f=-0.5\ T$

t = 65 ms

$\varepsilon=\frac{d\phi}{dt}\\\Rightarrow \varepsilon=\frac{A(B_f-B_i)}{dt}\\\Rightarrow \varepsilon=\frac{\pi 0.002^2(-0.5-1.5)}{0.065}\\\Rightarrow \varepsilon=-0.00038665\ V$

The magnitude of the induced emf is 0.00038665 V

3 0

3 years ago

A ____ is a region where jets of gas from young stars impact and heat the gas surrounding the young star.

podryga [215]

Answer:

Hi, There! my name is Jay And I'm here to help!

<h2>Question</h2>

A ____ is a region where jets of gas from young stars impact and heat the gas surrounding the young star.

<h2>Answer</h2>

bipolar outflow

Explanation:

A bipolar outflow is a stream of matter in two opposing directions from a object, Most likely a star.

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Hope this Helps!

Take Care!

Have a great day!

$-Jay-$

3 0

2 years ago

Read 2 more answers