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
Darina [25.2K]
3 years ago
7

Sally and Ramona were competing in a four-lap, one-mile foot race. Sally’s style was to run at a constant rate of 12 mph. Ramona

decided to run her first three laps at 11 mph, and save a ‘kick’ in order to run a 16 mph pace for the fourth and final lap. Who wins the race, and by how many minutes or seconds?
Physics
1 answer:
svetoff [14.1K]3 years ago
7 0

Sally wins the race by 0.03 min

Explanation:

To find time = distance / velocity

Sally;

1 mile / 12 mph

= ¹/12 hrs * 60

= 5 min

Ramona;

³/4 mile ÷ 11 mph  +  ¹/4 mile ÷ 16 mph

= ³/44 hrs + ¹/64 hrs

= 4.09 min + 0.94 min

= 5.03 min

You might be interested in
If a spacecraft in earth orbit is pushed by a thruster what will happen?
grin007 [14]

For the orbital speed of a spacecraft we know that

v = \sqrt{\frac{GM}{r}}

here

M = mass of the planet around which satellite is revolving

r = orbital radius

Now when thruster is used by the spacecraft its speed will change due to which orbital speed will change.

Since here while changing the speed mass of the planet will be same

we can say the speed of the spacecraft will changed by thruster due to which its orbital radius will change

so the correct answer must be

<em>b. the spacecraft will change motion and will maintain this new orbit until the thruster is fired again.</em>

8 0
3 years ago
Que es fluir en fisica?
Dvinal [7]

Answer:

what is flowing in physical?

Explanation:

5 0
3 years ago
Read 2 more answers
why can we use P=VI in the question electric bulb base generator is rated 220 volts and 100W when it is operated on 110v what wi
MrRissso [65]

Answer:

Correct answer:  P₂ = 25 W

Explanation:

Given: voltage V₁ = 220 V, power P₁ = 100 W, V₂ = 110 V, P₂ = ?

The formula for calculating power is:

P = V · I

We will include in the story and ohm's law:

I = V/R

We will replace the current in the expression for power

P = V · V/R = V²/R  ⇒ R = V²/P

We will first calculate the electrical resistance of the bulb which is a constant in the electrical circuit

R = V₁²/P₁ = 220²/ 100 = 48,400 / 100 = 484 Ω

Power consumption of bulb connected to 110 V is:

P₂ = V₂²/R = 110²/484 = 12,100/484 = 25 W

P₂ = 25 W

God is with you!!!

8 0
3 years ago
Question 3 of 5 What happens to the particles in a substance as it melts? O A. The particles slow down and become fixed in place
Mars2501 [29]

Answer:

D. The particles move more quickly and begin to move from place to place.

Explanation:

4 0
3 years ago
Most of our brains activity is:
zhenek [66]
Most of our brain activity is unconscious
3 0
4 years ago
Other questions:
  • When you are running around a track, what kind of energy are you using?
    12·1 answer
  • _______________ appears on the ecg as having no p wave, a wide qrs complex, and t waves that deflect in the opposite direction f
    8·1 answer
  • What is mitochondrion?
    14·2 answers
  • Which location would the selected items BEST fit on the nuclear energy diagram?
    12·2 answers
  • Where does the equilibrium point occur in a reaction system?. A) the equilibrium point occurs at the highest value of the cell p
    6·2 answers
  • Which is mostly an example of pseudoscience
    13·1 answer
  • Find the radioactivity of a 1 g sample of 226Ra given that <img src="https://tex.z-dn.net/?f=t_%7B1%2F2%7D%3D1620" id="TexFormul
    8·1 answer
  • As a bicycle pump inflates a tyre, it pressure rises from 30 kPa to 40 kPa at constant temperature of 30 °C. By assuming the air
    5·1 answer
  • A trolley is moving at constant speed in a friction compensated track. Some plasticine is dropped on the trolley and sticks on i
    15·1 answer
  • a mass m at the end of a spring oscillates with a frequency of 0.78 hz . when an additional 730 g mass is added to m, the freque
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!