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
kirill115 [55]
3 years ago
12

You could use an elevator or the stairs to lift a box to tenth floor.which has greater power?

Physics
1 answer:
erastova [34]3 years ago
7 0

Stairs don't have any power at all.  All the energy used to climb them
has to come from your muscles.

An elevator gets its power from the electric motors that lift it.  All YOU
have to do is stand there and look around.

All of this is a big part of the reason why elevators have become so
popular, and why no buildings with more than a few floors were built
before elevators were invented.


You might be interested in
One alternative to burning non-renewable fuels, which harm the environment, could be to burn (2 points) biomass. coal. natural g
Natalka [10]
Biomass would be the most likely answer. 
6 0
3 years ago
Read 2 more answers
Find the scaler product of this two vector
OLga [1]

Answer:

The scalar product of a and b is: a · b = |a||b| cosθ

5 0
3 years ago
Why collaboration in science is critical to success in the scientific community
Marianna [84]
Collaboration in science is important because if only one scientist does an experiment, and gets a result, he/she could have messed. So this is where collaboration comes in. A few other scientists could try the experiment, and if they get the same answers, the result may be proven correct.


Hope this helped!
5 0
3 years ago
If a ball that is 10 meters above the ground is thrown horizontally at 5.51 meters per second. a. how long will it take for the
GalinKa [24]

Answer:

a. t = 1.43 s

b. d = 7.88 m

Explanation:

a. The time of flight can be found using the following equation:

y_{f} = y_{0} + v_{0_{y}}t - \frac{1}{2}gt^{2}

Where:

y_{f}: is the final height = -10 m

y_{0}: is the initial height = 0

v_{0_{y}}: is the initial speed in the vertical direction = 0

g: is the acceleration due to gravity = 9.81 m/s²

By solving the above equation for "t" we have:

t = \sqrt{\frac{2y_{f}}{g}} = \sqrt{\frac{2*10 m}{9.81 m/s^{2}}} = 1.43 s

Hence, the ball will hit the ground in 1.43 s.

b. The distance in the horizontal direction can be found as follows:

x_{f} = x_{0} + v_{0}t + \frac{1}{2}at^{2}

Where:

x₀: is the initial position in the horizontal direction = 0

a: is the acceleration in the horizontal direction = 0 (it is moving at constant speed)

x_{f} = 5.51 m/s*1.43 s = 7.88 m

Therefore, the ball will travel 7.88 m before it hits the ground.

I hope it helps you!

4 0
3 years ago
Describe the initial horizontal and vertical velocity of a horizontally launched projectile on Earth, as well as what happens to
Jobisdone [24]

Answer:

Explained below

Explanation:

To explain this, let's consider a tennis ball being launched from the top of a very high building.

Now, if the tennis ball is launched horizontally without any upward angle but with an initial velocity of 10 m/s. In this motion, If there is no gravity, the tennis ball would continue in motion at that same speed of 10 m/s in the horizontal direction. However, in reality, gravity causes the tennis ball to accelerate downwards at a rate of 9.8 m/s for every second. This implies that the vertical velocity component is changing at the rate of 9.8 m/s every second.

Thus, after 1 second, horizontal velocity component will remain 10 m/s and vertical component will be 9.8 m/s × 1 = 9.8 m/s downwards.

Also, after 2 seconds, the vertical velocity component will remain 10 m/s, however the vertical component will now be 9.8 × 2 = 19.6 m/s downwards.

Same procedure is repeated as t increases by 1 second.

5 0
3 years ago
Other questions:
  • The head of a rattlesnake can accelerate at 40 m/s2 in striking a victim. If a car could do as well, how long would it take to r
    6·1 answer
  • Brainliest!!! A student wanted to answer the question, “How does the amount of glycerin affect the size of a bubble blown with s
    13·2 answers
  • The prominent semicircular space above a doorway in a Romanesque church portal is referred to as a ___________ and was often cov
    15·1 answer
  • What is the acceleration of a baseball when it is moving downward after being tossed directly upward?
    10·1 answer
  • What causes volcanoes to form? Give at least one example of a volcano. Did this volcano erupt and, if so, what was the result of
    11·1 answer
  • In the graph, the dotted line represents potential energy and the solid line represents kinetic energy.
    14·1 answer
  • To a motorist travelling due North at 50km/hr, the wind appears to come from North West at 60mk/hr. Find the true velocity of th
    6·1 answer
  • two cars collide at an intersection. one car has a mass of 1600 kg and is moving 8 m/s to the north, while the other has a mass
    7·1 answer
  • Complete the simulation for three different trails. Complete chart below, using the data for your simulation from each trail.
    9·2 answers
  • What is the mass of 2830 Newton's on Earth?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!