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NikAS [45]
3 years ago
13

Water is most dense at 4 degrees Celsius. Since at this temperature 1 ml of water has a mass of 1 g. What is its density?

Physics
2 answers:
sveticcg [70]3 years ago
7 0
The density is 1. 1/1=1
jolli1 [7]3 years ago
7 0

Answer: 1 g/cm³

Explanation:

The density of a substance is defined as the ratio of its mass to its volume.

At 4 °C, 1 mL water has 1 g mass.

1 mL = 1 cm³

Thus, ρ = m/V

m = 1 g

V = 1 cm³

⇒ ρ = m/V = 1 g/ 1 cm³

So, the density of water at 4° C is 1 g/cm³

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A bullet of mass 6.00 g is fired horizontally into a wooden block of mass 1.12 kg resting on a horizontal surface. The coefficie
zhannawk [14.2K]

Answer:

vo = 227 m/s

Explanation:

Let's analyze the problem, we have two parts one during the crash for which we will use the moment and another when it slides where we will use the energy. As we give the data of the latter let's start here

Before starting let's reduce the unit to the SI system

    m = 6.00 g (1kg / 1000g) = 6.00 10⁻³ kg

    M = 1.12 kg

We write the energy at two points, one initial right after the crash and another when the body has stopped

Just after shock

The bodies are united, so the mass is the sum of the mass of the bullet and the block

    Em₀ = K = ½ (m + M) v²

When the body has stopped

    Em_{f} = 0

When in the system there is friction force the variation the mechanical energy is equal to the work of the friction force. Notice that the force of friction opposes the movement so that their work is negative

    W fr = ΔEm = Em_{f} -Em₀

    -fr d = 0 - ½ (m + M) v²

To find the force of friction let's use Newton's second law

Axis y

    N-W = 0

    N = W = (m + M) g

The equation for the force of friction is

    fr = μ N

    fr = μ (m + M) g

Let's replace in the work and energy equation

    -μ (m + M) g d = 0 - ½ (m + M) v²

From here we can find the system speed. Let's calculate

    v³ = 2 μ g d

    v = √ (2μ gd)

    v = √ (2 0.250 9.8 0.300)

    v = 1.21 m / s

Now let's solve the crash, let's look for the moment before and after it

Before the crash

    po = m vo

After the crash

    p_{f} = (m + M) v

The system is formed by the bullet and the block, therefore, the forces during the impact are internal and the amount of movement is conserved

    po = p_{f}

    m vo = (m + M) v

    vo = v (m + M) / m

    vo = 1.21 (0.00600 + 1.12) /0.00600

    vo = 227 m / s

6 0
3 years ago
A paper airplane with mass 0.1 kg is flying 1.5 m above the ground with a speed of 2 m/s. what is the total mechanical energy of
Drupady [299]
Mechanical(ME) energy, in physical sciences, is the sum of kinetic energy (KE) and potential energy (PE). Below are the calculation in obtaining the energies,
 
     (1) KE =   0.5mv²     =  0.5(0.1 kg) x (2 m/s)² = 0.2 J
     (2) PE =    md          = (0.1 kg) x (1.5 m)        = 0.15 J
      (3) ME =  KE + PE = 0.2 J + 0.15 J               = 0.35 J

Thus, the mechanical energy is 0.35 Joules. 

3 0
3 years ago
Which of the following statements accurately describes work being done.
ivolga24 [154]

Charge is moved of a capacitor

4 0
3 years ago
Read 2 more answers
Uranium-238 eventually decays into
GalinKa [24]
Uranium-238 decays<span> by alpha emission </span>into<span> thorium-234, which itself </span>decays<span> by beta emission to protactinium-234, which </span>decays<span> by beta emission to </span>uranium<span>-234, and so on. The various </span>decay<span> products, (sometimes referred to as “progeny” or “daughters”) form a series starting at </span>uranium-238<span>.</span>
4 0
3 years ago
A 2N and 6N force pull on an object to the right and a 4N force pulls to the left a 0.5kg object. What is the net force on the o
Angelina_Jolie [31]

Explanation:

F net = 2+6-4 ( 2 and 6 N are in same direction so they get added, 4N in opposite direction so it will be subtracted)

F net=4 N

3 0
3 years ago
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