1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
iragen [17]
4 years ago
9

The odometer of a car reads 2000km at the start of at trip and 2400km at the end of the trip. If the trip took 8h.calculate tge

average speed of the car in km/h and m/s.
Physics
1 answer:
DIA [1.3K]4 years ago
7 0
Given:\\s=2400km-2000km=400km\\t=8h\\\\Find:\\v=?\\\\Solution:\\\\v= \frac{s}{t} \\\\v= \frac{400km}{8h} =50 \frac{km}{h} \\\\50 \frac{km}{h} \cdot \frac{1}{3,6} \approx 13,89 \frac{m}{s}
You might be interested in
A computer disk drive is turned on starting from rest and has a constant angular acceleration. If it took 0.750 seconds for the
Irina-Kira [14]

Answer:

a) Θ = ω₀*t + ½αt² To complete first revolution 2π rads = 0*t + ½αt² and to complete the first and second combined 4π rads = 0*t + ½α(t+0.810s)² Divide second by first: 2 = (t + 0.810s)² / t² This is quadratic in t and has roots at t = -0.336 s ← ignore and t = 1.96 s ◄ b) Use either equation from above: 2π rads = 0*t + ½α(1.96s)² α = 3.27 rad/s² ◄ Hope this helps!

Explanation:

6 0
4 years ago
A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 80.6 m/s at ground level.
galina1969 [7]

Answer:

44.64 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.8 m/s²

v^2-u^2=2as\\\Rightarrow v=\sqrt{2as+u^2}\\\Rightarrow v=\sqrt{2\times 4.2\times 1180+80.6^2}\\\Rightarrow v=128.01\ m/s

v=u+at\\\Rightarrow 128.01=80.6+4.2t\\\Rightarrow t=\frac{128.01-80.6}{4.2}=11.29\ s

<u>Time taken to reach 1180 m is 11.29 seconds</u>

v=u+at\\\Rightarrow 0=128.01-9.8t\\\Rightarrow t=\frac{128.01}{9.8}=13.06\ s

<u>Time the rocket will keep going up after the engines shut off is 13.06 seconds.</u>

v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{0^2-128.01^2}{2\times -9.8}\\\Rightarrow s=836.05\ m

The distance the rocket will keep going up after the engines shut off is 836.05 m

Total distance traveled by the rocket in the upward direction is 1180+836.05 = 2016.05 m

The rocket will fall from this height

s=ut+\frac{1}{2}at^2\\\Rightarrow 2016.05=0t+\frac{1}{2}\times 9.8\times t^2\\\Rightarrow t=\sqrt{\frac{2016.05\times 2}{9.8}}\\\Rightarrow t=20.29\ s

<u>Time taken by the rocket to fall from maximum height is 20.29 seconds</u>

Time the rocket will stay in the air is 11.29+13.06+20.29 = 44.64 seconds

5 0
3 years ago
What factors affect the frictional force between objects ?
g100num [7]
Well it should be Material and weight not sure 
4 0
3 years ago
Most of the energy released by nuclear fission is in the form of: alpha rays, beta rays, or gamma rays?
Sedbober [7]
I think it is <span>Alpha rays.</span>
3 0
3 years ago
When designing an experiment, it is important to make sure your hypothesis is
ra1l [238]
It's D) valid and testable.
6 0
4 years ago
Other questions:
  • When two or more waves are at the same place at the same time, which phenomena occurs
    15·2 answers
  • Which of the following is an example of heat convection?
    13·2 answers
  • A flat plate maintained at a temperature of 80°C experiences a flow of atmospheric air at 0°C. If the temperature gradient at th
    13·1 answer
  • The multipoint grounded neutral is intended to reduce the _____ neutral voltage drop, assist in clearing _____ line-to-neutral f
    7·1 answer
  • a toy car is wound up and released on the floor. it accelerates at a rate of 0.4 m/s/s . the mass of the care is 3kg. what is th
    13·1 answer
  • Enter a range of values for x.<br> a<br> a<br> 3x-90 930<br> 26<br> 27
    7·2 answers
  • How electromagnet works in circuit breaker
    12·1 answer
  • Based on its position in the periodic table of the elements, how many valence electrons does phosphorus (atomic number 15) have?
    5·2 answers
  • Which particles in an atom are acted upon by the strong force? A. Electrons and neutrons B. Neutrons and protons O C. Protons an
    14·1 answer
  • in the two cases shown the mass and the spring are identical but the amplitude of the simple harmonic motion is twice as big in
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!