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shepuryov [24]
4 years ago
10

How do you think momentum affects car crashes?

Physics
1 answer:
Ira Lisetskai [31]4 years ago
4 0
Scenario:
1 cars and 1 truck are headed straight for each-other both going 60mph however the the car weighs 2 tons while the truck weighs 5 tons. Once the Automobiles crash into each other the truck will push the car to the direction it was going since it has more energy in the crash. at the same moment of the automobiles crashing the people would theoretically carry all the kinetic energy in them and fly out the wind shield with around the same energy of the moving automobiles 
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A 60-watt light bulb has a voltage of 120 volts applied across it and a current of 0.5 amperes flows through the bulb. What is t
Naddik [55]

Answer: 240ohms

Explanation: P=IV

P=60watts

I=0.5A

V=120volts

From ohms law

V=IR

R=V/I

R=120/0.5

R= 240ohms

7 0
4 years ago
Upon being struck by 240-nm photons, a metal ejects electrons with a maximum kinetic energy of 2.97 eV. What is the work functio
Neko [114]

Answer:

Work Function = 3.53 x 10⁻¹⁹ J = 2.2 eV

Explanation:

The work function of the metal metal can be found as follows:

Energy of Photon = Work Function + K.E

hc/λ = Work Function + K.E

Work Function = hc/λ - K.E

where,

h = Plank's Constant = 6.625 x 10⁻³⁴ J.s

c = speed of light  = 3 x 10⁸ m/s

λ = wavelength of photons = 240 nm = 2.4 x 10⁻⁷ m

K.E = Maximum Kinetic Energy = (2.97 eV)(1.6 x 10⁻¹⁹ J/1 eV) =  4.752 x 10⁻¹⁹ J

Therefore,

Work Function = (6.625 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/(2.4 x 10⁻⁷ m) - 4.752 x 10⁻¹⁹ J

Work Function = 8.281 x 10⁻¹⁹ J - 4.752 x 10⁻¹⁹ J

<u>Work Function = 3.53 x 10⁻¹⁹ J = 2.2 eV</u>

4 0
3 years ago
An athlete in the early weeks of an aerobic training program develops a decreased hemoglobin concentration but does not report d
gizmo_the_mogwai [7]

Answer: B

Explanation: Hemoglobin is a protein in red blood cells that acts as the vehicle for oxygen and carbon dioxide from the lungs to tissues and vice-versa.

What is considered normal Hemoglobin levels vary throughout one's life, from childhood to adult life and in older adults. It even varies between women and men. In women, it also varies depending on whether they are pregnant or not.

When hemoglobin does become less than normal, it results in anemia, a condition accompanied by fatigue. Because the athlete does not have this symptom, he is not suffering from anemia, and so there is no cause for concern. Although the athlete's hemoglobin level has reduced, the absence of fatigue indicates that it is not lower than normal.

3 0
3 years ago
Water is traveling through a horizontal pipe with a speed of 1.7 m/s and at a pressure of 205 kPa. This pipe is reduced to a new
Arturiano [62]

Answer:

The velocity is  v_2 =  6.8 \ m/s

The pressure is  P_2 =  204978 Pa

Explanation:

From the question we are told that

 The speed at which water is travelling through is  v = 1.7 \ m/s

  The pressure is  P_1 = 205  k  Pa =  205 *10^{3} \ Pa

   The diameter of the new pipe is d =  \frac{D}{2}

Where D is the diameter of first pipe

   

According to the principal of continuity we have that

       A_1 v_1 =  A_2 v_2    

Now  A_1 is the area of the first pipe which is mathematically represented as

       A_1 = \pi  \frac{D^2}{4}

and  A_2 is the area of the second pipe which is mathematically represented as  

       A_2 = \pi  \frac{d^2}{4}

Recall   d =  \frac{D}{2}

        A_2 = \pi  \frac{[ D^2]}{4 *4}

        A_2 = \frac{A_1}{4}

So    A_1 v_1 =  \frac{A_1}{4}  v_2

substituting value

        1.7 =  \frac{1}{4}  * v_2    

        v_2 =  4 * 1.7    

       v_2 =  6.8 \ m/s

   

According to Bernoulli's equation  we have that

     P_1 + \rho \frac{v_1 ^2}{2} =  P_2 + \rho \frac{v_2 ^2}{2}

substituting values

     205 *10^{3 }+ \frac{1.7 ^2}{2} =  P_2 +  \frac{6.8 ^2}{2}

     P_2 =  204978 Pa

4 0
3 years ago
How are the protons and electrons related to each other
vodka [1.7K]
Each element has the same number of electrons and protons. Electrons are negatively charged, and protons are positively charged.
6 0
3 years ago
Read 2 more answers
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