Answer:

**Answer: 7kg I think or 6**

**Explanation:**

The speed of light is 3.00×108m/s. How long does it take for light to travel from Earth to the Moon and back again? Express your answer using two significant figures.

For a very rough pipe wall the friction factor is constant at high Reynolds numbers. For a length L1 the pressure drop over the length is p1. If the length of the pipe is then doubled, what is the relation of the new pressure drop p2 to the original pressure drop p1 at the original mass flow rate?

Energy can be transferred from a closed system to the surroundings by: (A) Internal chemical reactions (B) Heat (C) Shaft work (D) Change in pressure without changing volume (E) Mass transfer

A 6.0-cm-diameter horizontal pipe gradually narrows to 4.0 cm. When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 32.0 kPa and 24.0 kPa, respectively. What is the volume rate of flow?

The Golden Gate Bridge in San Francisco has a main span of length 1.28 km, one of the longest in the world. Imagine that a steel wire with this length and a cross-sectional area of 3.10 ✕ 10^−6 m^2 is laid on the bridge deck with its ends attached to the towers of the bridge, on a summer day when the temperature of the wire is 43.0°C. When winter arrives, the towers stay the same distance apart and the bridge deck keeps the same shape as its expansion joints open. When the temperature drops to −10.0°C, what is the tension in the wire? Take Young's modulus for steel to be 20.0 ✕ 10^10 N/m^2. (Assume the coefficient of thermal expansion of steel is 11 ✕ 10−6 (°C)−1.)

For a very rough pipe wall the friction factor is constant at high Reynolds numbers. For a length L1 the pressure drop over the length is p1. If the length of the pipe is then doubled, what is the relation of the new pressure drop p2 to the original pressure drop p1 at the original mass flow rate?

Energy can be transferred from a closed system to the surroundings by: (A) Internal chemical reactions (B) Heat (C) Shaft work (D) Change in pressure without changing volume (E) Mass transfer

A 6.0-cm-diameter horizontal pipe gradually narrows to 4.0 cm. When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 32.0 kPa and 24.0 kPa, respectively. What is the volume rate of flow?

The Golden Gate Bridge in San Francisco has a main span of length 1.28 km, one of the longest in the world. Imagine that a steel wire with this length and a cross-sectional area of 3.10 ✕ 10^−6 m^2 is laid on the bridge deck with its ends attached to the towers of the bridge, on a summer day when the temperature of the wire is 43.0°C. When winter arrives, the towers stay the same distance apart and the bridge deck keeps the same shape as its expansion joints open. When the temperature drops to −10.0°C, what is the tension in the wire? Take Young's modulus for steel to be 20.0 ✕ 10^10 N/m^2. (Assume the coefficient of thermal expansion of steel is 11 ✕ 10−6 (°C)−1.)

**Answer:**

**Explanation:**

We can use Ohm's Law to find the resistance R of a wire that carries a current I under a given potential difference:

Answer:

Ohm's law states that I=V/R (Current=volts divided by resistance). Since we're looking for resistance, we'll rewrite it as R=V/I. Then just plug in the numbers; R=84/9, R= 9 1/3 or 28/3. The resistance of the wire is 9.33... or 9 1/3 ohm's, depending on how you wanna write it.

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**Answer:**

Taking the x axis to the right and the y axis to be up, the total change of momentum is

**Explanation:**

The momentum is given by:

where **m** is the **mass** and is the **velocity**. Now, taking the suffix** i **for the** initial condition**, and the suffix **f** for the** final condition**, the change in momentum will be:

As we know the mass of the ball, we just need to find the initial and final velocity.

Knowing the magnitude and direction of a vector, we can obtain the **Cartesian components** with the formula

where is the **magnitude** of the vector and **θ** is the **angle measured from the x axis**.

**Taking the x axis to the right and the y axis to be up, the initial velocity will be: **

where **minus sign** appears cause the ball is going downward, and **we subtracted** the 31 ° as it was measured from the y axis

So, the** initial velocity** is

The **final velocity** is

So, the change in momentum will be

(B) False

**Answer:**

(B) False

**Explanation:**

No, it is not possible to have thunder without lightning. Thunder is a direct result of lightning.

B False because facts

**Answer**

given,

weight of solid sphere = 24.1 N

m = 24.1/g = 24.1/10 = 2.41 Kg

radius = R = 0.151 m

height of the ramp = 1.7 m

angle with horizontal = 34°

acceleration due to gravity = 10 m/s²

using energy conservation

I for sphere

v = r ω

**v = 4.93 m/s**

b) rotational kinetic energy

**KE = 11.71 J**

c) Translation kinetic energy

**Answer:**

The correct answer is d. tension pneumothorax.

**Explanation:**

The increasing build-up of air that is in the pleural space is what we call the tension pneumothorax and this happens due to the lung laceration that lets the air to flee inside the pleural space but it does not return.

(a) The **acceleration **of the bird is . The negative sign indicated the opposite direction of **motion**. (b) The final speed is .

Given:

Initial speed,

Final speed,

Time,

The acceleration can be computed from the **velocities **and time. The standard unit of acceleration is a meter per second square.

(a)

The acceleration is computed as:

Hence, the acceleration of the bird is . The negative sign indicated the opposite direction of motion.

(b)

The final **speed **as the given time can be computed from the first equation of motion. The first equation of motion gives the relation between final and initial speed, acceleration, and **time**.

The **final speed **at time 1.2 seconds is equal to:

Hence, the final **speed **is .

To learn more about **Acceleration**, here:

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