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
mariarad [96]
3 years ago
10

The formula d = t² + 5 t expresses a car's distance (in feet) from a stop sign, d, in terms of the number of seconds t since it

started moving.
Determine the car's average speed over the interval of time from t = 4 seconds to t = 7 seconds.
Physics
1 answer:
Lubov Fominskaja [6]3 years ago
3 0

Answer:

The car's average speed is 16 feet per second.

Explanation:

The expression for the average speed is as follows;

A.S=\frac{\textrm{Total distance}}{\textrm{total time}}

Given expression of distance:

d=t^{2}+5t

Put t= 4 s.

d(4)=(4)^{2}+5(4)

d(4)= 36 ft

Put t= 7 s in the given expression.

d(7)=(7)^{2}+5(7)

d(7)= 84 ft

Calculate the car's average speed over the interval of time from t = 4 seconds to t = 7 seconds.

A.S=\frac{d(7)-d(4)}{7-4}

A.S=\frac{84-36}{7-4}

A.S= 16 feet per second

Therefore, the car's average speed is 16 feet per second.

You might be interested in
Mechanics is the study of
svetoff [14.1K]
Mechanics is the study of motion and force on physical objects and their surroundings
4 0
3 years ago
10. Suppose the tern travels 1.70*10^ km south, only to encounter bad weatherInstead of trying to fly around the stormthe tem tu
Ghella [55]

We can define average speed as the quotient between the whole distance traveled and the time it takes to travel that distance, and the velocity as the quotient between the displacement and the time it takes to displace that quantity.

We will find that:

Average speed =  2.6×10^2 km/day

Velocity = 2.52×10^2 km/day

So we know that:

The tent travels:

1.70×10^4 km to the south

6.00×10^2 km to the north

1.44×10^4 km to the south.

The total distance traveled is just the sum of the 3 above distances:

total distance = 1.70×10^4 km +  6.00×10^2 km + 1.44×10^4 km

Notice that the second term has a different exponent than the others, so to have the same exponent we can write:

6.00×10^2 km = 0.06×10^4 km

Now we get:

total distance = 1.70×10^4 km + 0.06×10^4 km + 1.44×10^4 km

total distance = (1.70 + 0.06 + 1.44)×10^4 km

<u>total distance = 3.2×10^4 km</u>

And it travels that distance in 122 days, then the average speed is:

AS = (3.2×10^4 km)/(122 days) = 2.6×10^2 km/day

Now we need to find the displacement, which is the difference between the final position and the initial position, the displacement will just be:

d =  1.70×10^4 km - 0.06×10^4 km + 1.44×10^4 km

(We add the distance traveled to south and subtract the distance that it travels due north)

d = (1.70 - 0.06 + 1.44)×10^4 km = 3.08×10^4 km

Then the velocity will be:

v = (3.08×10^4 km)/(122 days) = 2.52×10^2 km/day

Because we defined south as positive and north as negative, having a positive velocity means that the direction of the <u>velocity is due south.</u>

If you want to learn more, you can read:

brainly.com/question/12322912

 

3 0
2 years ago
Which of these would have the largest volume?
brilliants [131]
Shopping mall has the largest volume
5 0
3 years ago
Read 2 more answers
An objest with the mass of 2 kg is accelerated at 4 m/s2. the net force acting on the object is
poizon [28]
From Newton’s 2nd law of motion
F=ma
= 2*4
=8N

8N should be the answer
5 0
3 years ago
Why are L waves not usually seen on a seisogram?
bogdanovich [222]
Because P waves are the fastest seismic waves, they will usually be the first ones that your seismograph... sorry couldn't find anymore info from my teacher, well I couldn't remember all of it.
3 0
3 years ago
Other questions:
  • Why is it possible to throw a 0.145 kg baseball much further than a 7 kg bowling ball?
    13·1 answer
  • True or False. If a desk is pushed at a
    13·1 answer
  • Galileo discovered that the orbits in which planets move around the Sun are elliptical.
    14·2 answers
  • Suppose a profit-maximizing firm in a competitive market produces rubber bands. When the market price for rubber bands falls bel
    7·1 answer
  • One of the predicted problems due to global warming is that ice in the polar ice caps will melt and raise sea level everywhere i
    13·1 answer
  • Science: Work, Power and Efficiency Practice Problems:
    11·1 answer
  • A quasar is a distant celestial body in space. Investigators use a special telescope and determine that a certain quasar was giv
    7·1 answer
  • a que velocidad en km/h corrio usain bolt en el capeonato mundial de berlin en 2009 para batir el record mundial de los 100 m pl
    11·1 answer
  • A current of 15 Amps flows through a circuit with a resistance of 0.10 Ohms. What is the voltage?
    15·1 answer
  • Clouds form when water vapor in the air ______.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!