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kondor19780726 [428]
3 years ago
6

90Th234 What element atom is formed when the thorium nucleus is оруулах-decomposed?​

Physics
1 answer:
Archy [21]3 years ago
8 0

This question is from course hero.

So better check this question!

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A cube of wood with a density of 0.780 g/cm 3 is 10.0 cm on each side. When the cube is placed in water, what buoyant force acts
BlackZzzverrR [31]

Answer:

The buoyant force on the wood = 7.652 N

Explanation:

According to the principle of flotation, a body floats when the upthrust exerted upon it by the fluid n which it floats equals the weight of the body.

W = U ............... Equation.

Where W = weight of the wood, U = Upthrust or buoyant force.

Recall That,

Density = mass/volume

Mass = Density×volume

m = D×V........................ Equation 2

Where m = mass of the wood, V = Volume of the wood, D = Density of the wood.

But

Volume of a cube = a³

V = a³ where a = length of the cube.

V = 10³ = 1000 cm³.

Given: V = 1000 cm³ D = 0.780 g/cm³

Substituting these values into equation 2,

m = 1000(0.780)

m = 780 g

m = 0.78 kg.

But W = mg

Where m = 0.78 kg, g = 9.81 m/s²

W = 0.78(9.81)

W = 7.652 N.

Since W = U = 7.652 N.

U = 7.652 N

Therefore the buoyant force on the wood =7.652 N

5 0
2 years ago
What is the idea that tectonic plates move around called
Margaret [11]
Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. The plates act like a hard and rigid shell compared to Earth's mantle. This strong outer layer is called the lithosphere, which is 100 km (60 miles) thick, according to Encyclopedia Britannica. The lithosphere includes the crust and outer part of the mantle.
3 0
2 years ago
An RLC series circuit consists of a 50 Ω resistor, a 200 μF capacitor, and a 120-mH inductor whose coil has a resistance of 20 Ω
solmaris [256]

Answer:

182.9 Volts

Explanation:

R = resistance of the resistor = 50 Ω

C = capacitance of the capacitor = 200 μF = 200 x 10⁻⁶ F

L = Inductance of the inductor = 120 mH = 0.12 H

f = frequency = 60 Hz

Capacitive reactance is given as

X = (2πfC)⁻¹

X = (2(3.14) (60) (200 x 10⁻⁶))⁻¹

X = 13.3 Ω

Inductive reactance is given as

X' = 2πfL

X' = 2(3.14) (60) (0.12)

X' = 45.2 Ω

Impedance of the circuit is given as

z = √(R² + (X' - X)²)

z = √(50² + (45.2 - 13.3)²)

z = 59.31 Ω

V = rms emf of the source = 240 Volts

rms voltage across the inductor is given as

V' = V z⁻¹ X'

V' = (240) (59.31)⁻¹ (45.2)

V' = 182.9 Volts

5 0
3 years ago
In the Winter Olympics, an ice skater may lift his partner high above his head. A typical female ice skater weighs 400 N, and th
mars1129 [50]
A. and C. are both correct. Work is force x distance, and 1 J is 1 N-m .
5 0
3 years ago
A hunter on a frozen, essentially frictionless pond uses a rifle that shoots 4.20 gg bullets at 970 m/sm/s. The mass of the hunt
Dovator [93]

Answer:

0.059\ \text{m/s}

Explanation:

m_1 = Mass of bullet = 4.2 g

u_1 = Initial velocity of bullet = 0

m_2 = Mass of hunter with rifle = 69.5 kg

u_2 = Initial velocity of hunter with rifle

v_1 = Final velocity of the bullet = 970 m/s

v_2 = Final velocity of the hunter with the rifle

As the momentum of the system is conserved we have

m_1u_1+m_2u_2=m_1v_1+m_2v_2\\\Rightarrow v_2=\dfrac{m_1u_1+m_2u_2-m_1v_1}{m_2}\\\Rightarrow v_2=\dfrac{0-0-0.0042\times 970}{69.5}\\\Rightarrow v_2=-0.059\ \text{m/s}

The recoil speed of the hunter is 0.059\ \text{m/s} in the opposite direction of the bullet.

8 0
3 years ago
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