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nalin [4]
3 years ago
10

When jogging outside you accidentaly bumb into a curb. Your feet stop but your body continues to movr foward and you end up on t

he ground. Which law of motion is being described in this scenario?
A.Law of universal gravitation
B.Newton's first law of motion
C.Law of conservation of energy
D. Newton's second law of Motion
Physics
2 answers:
sattari [20]3 years ago
8 0
B.) Newtons first law of motion
Monica [59]3 years ago
7 0
It is his first law of motion it states "Every object persists in its state of rest or uniform motion in a straight line unless it is compelled to change that state by forces impressed on it"<span />
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Nichrome wire, often used for heating elements, has resistivity of 1.0 × 10-6 Ω ∙ m at room temperature. What length of No. 30 w
worty [1.4K]

Answer:

Length = 2.453 m

Explanation:

Given:

Resistivity of the wire (ρ) = 1 × 10⁻⁶ Ω-m

Diameter of the wire (d) = 0.250 mm = 0.250 × 10⁻³ m

Resistance of the wire (R) = 50 Ω

Length of the wire (L) = ?

The area of cross section is given as:

A=\frac{1}{4}\pi d^2\\\\A=\frac{1}{4}\times\ 3.14\times (0.250\times 10^{-3})^2\\\\A=0.785\times 6.25\times 10^{-8}\\\\A=4.906\times 10^{-8}\ m^2

We know that, for a constant temperature, the resistance of a wire is directly proportional to its length and inversely proportional to its area of cross section. The constant of proportionality is called the resistivity of the wire. Therefore,

R=\rho \frac{L}{A}

Expressing the above in terms of length 'L', we get:

L=\frac{RA}{\rho}

Plug in the given values and solve for 'L'. This gives,

L=\frac{50\times 4.906\times 10^{-8}}{1\times 10^{-6}}\ m\\\\L=\frac{2.453}{1}=2.453\ m

Therefore, length of No. 30 wire (of diameter 0.250 mm) is 2.453 m.

4 0
3 years ago
INQUIRY IS A TYPE OF SCIENCE PROMPTED BY A QUESTION<br> TRUE OR FALSE
slamgirl [31]
The answer is clearly True
4 0
3 years ago
Read 2 more answers
Disadvantages of magnets
qwelly [4]

one disadvantage is that magnets the opposites attract so the same type of magnets like n+n will keep repelling unless you use the opposite side of the magnet the it will attract

4 0
3 years ago
A car traveling at 50 km/h hits a bridge abutment. A passenger in the car moves forward a distance of 61 cm (with respect to the
Karolina [17]

Answer:

6957.04N

Explanation:

Using

vf2=vi2+2ad

But vf = 0 .

So convert 50km/hr to m/s, and you need to convert 61 cmto m

(50km/hr)*(1hr/3600s)*(1000m/km) = 13.9m/s

61cm * (1m/100cm) = .61m

So n

0 = (13.9m/s)^2 + 2a(.61m)

a = 158.11m/s^2

So

using F = ma

F = 44kg(158.11m/s^2) = 6957.04N

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3 years ago
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Suppose you wish to construct a motor that produces a maximum torque whose magnitude is 1.7 × 10-2 N·m. The coil of the motor ha
Len [333]

Answer:

86 turns

Explanation:

Parameters given:

Magnetic torque, τ = 1.7 * 10^(-2) Nm

Area of coil, A = 9 * 10^(-4) m²

Current in coil, I = 1.1 A

Magnetic field, B = 0.2 T

The magnetic toque is given mathematically as:

τ = N * I * A * B

Where N = number of turns

To find the number of turns, we make N subject of formula:

N = τ/(I * A * B)

Therefore:

N = (1.7 * 10^(-2)) / (1.1 * 9 * 10^(-4) * 0.2)

N = 85.85 = 86 turns (whole number)

The number of turns must be 86.

3 0
3 years ago
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