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
lyudmila [28]
3 years ago
15

A train is uniformly accelerated and passes

Physics
1 answer:
cupoosta [38]3 years ago
6 0

Answer:

Explanation:

18 km/hr(1000 m/km) / (3600 s/hr) = 5 m/s

36 km/hr = 10 m/s

v² = u² + 2as

a = (v² - u²)/2s

a = (10² - 5²)/2(1000) = 0.0375 m/s²

v² = 10² + 2(0.0375)(1000)

v² = 175

v = 13.22875... ≈ 13 m/s ≈ 48 km/hr

v = u + at

t = (v - u) / a

t = (10 - 5)/0.0375 = 133.333... 133 s

t = (13.22875 - 10) / 0.0375 = 86.1 s

You might be interested in
4. A tuning fork is held over a resonance tube, and resonance occurs when the surface of the water is 12 cm below the top of the
Mrac [35]

As we know that speed of sounds is given as

v = 332 + 0.6t

here we know that

t = 23 degree C

now from above equation we will have

v = 332 + (0.6)(23)

v = 345.8 m/s

now we also know that distance between two consecutive resonance length is half of the wavelength

L_2 - L_1 = \frac{\lambda}{2}

34 - 12 = \frac{\lambda}{2}

\lambda = 44 cm

now we know that

frequency = \frac{speed}{wavelength}

f = \frac{345.8}{0.44} = 786 Hz

so frequency will be 786 Hz

7 0
3 years ago
Why must we be careful when measuring current with a DMM?
Lemur [1.5K]

Answer:

DMM should be placed in the series combination with the circuit.

Explanation:

DMM is the digital multi meter. It can measure the voltage, current and resistance at a time.

  • While measuring the current with the DMM you must be ensure that the DMM should be connected with the circuit in series combination. So that it will give the resultant current accurately.
  • While measuring the voltage the observer should check the open probes.
4 0
3 years ago
Two point sources are vibrating in phase producing two-dimensional water wave interference. The first antinodal line on either s
Viktor [21]

For all antinodal positions we know that

\Delta \phi = 2N\pi

now we also know the relation between phase difference and path difference

\Delta \phi = \frac{2\pi}{\lambda}\Delta x

now we will have

2N\pi = \frac{2\pi}{\lambda}\Delta x

now from above equation we will have

\Delta x = N\lambda

now for the first anti node position

N = 1

\Delta x = \lambda

Option D is correct

4 0
3 years ago
A 7.7 kg sphere makes a perfectly inelastic collision with a second sphere initially at rest. The composite system moves with a
klemol [59]

Answer:

15.4 kg.

Explanation:

From the law of conservation of momentum,

Total momentum before collision = Total momentum after collision

mu+m'u' = V(m+m').................... Equation 1

Where m = mass of the first sphere, m' = mass of the second sphere, u = initial velocity of the first sphere, u' = initial velocity of the second sphere, V = common velocity of both sphere.

Given: m = 7.7 kg, u' = 0 m/s (at rest)

Let: u = x m/s, and V = 1/3x m/s

Substitute into equation 1

7.7(x)+m'(0) = 1/3x(7.7+m')

7.7x = 1/3x(7.7+m')

7.7 = 1/3(7.7+m')

23.1 = 7.7+m'

m' = 23.1-7.7

m' = 15.4 kg.

Hence the mass of the second sphere = 15.4 kg

7 0
3 years ago
Read 2 more answers
What is the bump on the lateral side just proximal to the 5th metatarsal?
xeze [42]
The description refers to the styloid process or tuberosity. This styloid process is seen in the 5th metatarsal and this area shows the fifth metatarsal's growth plate. This bone is being attached by strong tendon known as the <span>Peroneus brevis tendon.</span>
6 0
4 years ago
Other questions:
  • In a double slit experiment, if the separation between the two slits is 0.050 mm and the distance from the slits to a screen is
    10·1 answer
  • The crate is at rest on the incline. What can you say about the force of friction acting on the crate?A. the frictional force po
    9·1 answer
  • A car travelling at a constant speed of 70km/h passes a stationary police car. The police car immediately goes on the chase acce
    6·1 answer
  • Is a snowball melting in my hand? <br> convection, conduction, radiation<br> Which one?
    12·1 answer
  • What is the direction of the magnetic field b⃗ net at point a? Recall that the currents in the two wires have equal magnitudes.
    5·1 answer
  • Give reason Pascal is a derived unit​
    13·1 answer
  • You leave your house at 7:50
    9·2 answers
  • What are some possible sources of motion that could be harnessed for a generator?
    14·1 answer
  • Use the velocity vs time graph to analyze the motion of the object.
    5·1 answer
  • exhibit 6-5 the weight of items produced by a machine is normally distributed with a mean of 8 ounces and a standard deviation o
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!