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
Allisa [31]
3 years ago
13

A car travels 300 km in the first 3 hours of a trip. Then it hits traffic and travels only 60 km during the last hour. What is t

he average speed of the car?
a.) 180 km/h
b.) 100 km/h
c.) 90 km/h
d.) 120 km/h
Physics
1 answer:
Nadusha1986 [10]3 years ago
6 0

Question

A car travels 300 km in the first 3 hours of a trip. Then it hits traffic and travels only 60 km during the last hour. What is the average speed of the of the car?


300 + 60 = 360 Km (total travel)

3 + 1 = 4 hours (total time)

360 : 4 = 90


C.) 90 Km/h is your answer


You might be interested in
A watt is a unit of<br><br>light<br>power<br>force<br>motion<br>energy
Crazy boy [7]

The answer would be Power

3 0
3 years ago
If sound travels at 5600 m/s through a steel rod,what is the wavelength,given a wave frequency of 2480 Hz
Feliz [49]

Answer:

wavelength = 5600/2480= 2.25m

6 0
3 years ago
A train travels 190km in 3.0 hours and then 120 km in 2.0 hours. What is it’s average speed ?
xxMikexx [17]

Answer:

60 km/h

Explanation:

Simplify the speed:

120÷2=60

Hence, the average speed is 60 km/h.

6 0
2 years ago
Why quantity refractive index dooesn't have unit
ASHA 777 [7]
Refractive Index is a ratio of two similar physical quantity which is dimension less
refractive index = sin I / sin r

therefore it doesn't have a unit.
5 0
3 years ago
Read 2 more answers
A student standing on a stationary skateboard tosses a textbook with a mass of mb = 1.35 kg to a friend standing in front of him
nataly862011 [7]

Answer:

a) u_c=0\ m.s^{-1}       &        m_c.v_c=m_b.v_b\times \cos\theta

b) v_c=0.0566\ m.s^{-1}

c) p_e=2.9218\ kg.m.s^{-1}

Explanation:

Given:

mass of the book, m_b=1.35\ kg

combined mass of the student and the skateboard, m_c=97\ kg

initial velocity of the book, v_b=4.61\ m.s^{-1}

angle of projection of the book from the horizontal, \theta=28^{\circ}

a)

velocity of the student before throwing the book:

Since the student is initially at rest and no net force acts on the student so it remains in rest according to the Newton's first law of motion.

u_c=0\ m.s^{-1}

where:

u_c= initial velocity of the student

velocity of the student after throwing the book:

Since the student applies a force on the book while throwing it and the student standing on the skate will an elastic collision like situation on throwing the book.

m_c.v_c=m_b.v_b\times \cos\theta

where:

v_c= final velcotiy of the student after throwing the book

b)

m_c.v_c=m_b.v_b\times \cos\theta

97\times v_c=1.35\times 4.61\cos28

v_c=0.0566\ m.s^{-1}

c)

Since there is no movement of the student in the vertical direction, so the total momentum transfer to the earth will be equal to the momentum of the book in vertical direction.

p_e=m_b.v_b\sin\theta

p_e=1.35\times 4.61\times \sin28^{\circ}

p_e=2.9218\ kg.m.s^{-1}

6 0
3 years ago
Other questions:
  • A rock group is playing in a bar. Sound emerging from the door spreads uniformly in all directions. The intensity level of the m
    14·2 answers
  • When water freezes, the density decreases and the bonds between molecules become stronger. Do you expect the speed of sound to b
    6·1 answer
  • The expanding gases that leave the muzzle of a rifle also contribute to the recoil. A .30 caliber bullet has mass 7.20×10−3 kg a
    8·1 answer
  • A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s . As she draws her arms an
    13·1 answer
  • The amplitude of a sound wave determines it's
    10·2 answers
  • John rides his motorcycle with a constant speed of 40 miles per hour. How far can he travel in 1/2 an hour?
    14·1 answer
  • The Sun’s surface temperature is about 5800 K and its spectrum peaks at 5000 Å. An O-type star’s surface temperature may be 40,0
    10·1 answer
  • Playing catch with a friend in a moving train. When you toss the ball in the direction the train is moving, how does the speed o
    12·2 answers
  • How to be good at rocket league
    13·2 answers
  • A lorry of mass 12,000kg travelling at a velocity of 2 m/s collides with a stationary car of mass 1500kg. The vehicles move toge
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!