One man lifts a 300 kg crate from the ground to the top of a loading dock 1 meter high. Another man lifts the same crate using a ramp 3 meters long, 1 meter high. What can you say about the amount of work being done?
Select one:
a. More work is done when the crate is lifted without the ramp.
b. More work is done when the ramp is used.
c. No work is done.
d. The same amount of work is done.
Answer:
D
Explanation:
Work done =force x distance in the direction of force applied
I think its d
A 5 kg toy truck moves to 2 m/s east , it colllides head-on with a2kg toy car moving 5 m/s moving west . What is the total momentum of the system?
A) kgm/s 30
B) kgm/s 0
C) kgm/s -20
D) non of it
Momentum
eastward = +
westward = -
[tex]\tt P_A=5\times 2=10~kg.m/s\\\\P_B=2\times 5=-10~kg.m/s[/tex]
total momentum:
[tex]\tt P_A+P_B=10-10=0~kg.m/s[/tex]
) The magnitude of scalar product of two unit vectors perpendicular to each other is
This question involves the concept of the scalar product.
The magnitude of the scalar product will be "0".
SCALAR PRODUCTThe scalar product, also known as the dot product of the two vectors is given by the following formula:
[tex]A.B = |A||B|Cos\theta[/tex]
where,
A.B = Scalar product = ?|A| = Mangnitude of vector A = 1 unit|B| = Magnitude of Vector B = 1 unitθ = Angle between vectors = 90°Therefore,
[tex]A.B = (1)(1)Cos90^o = (1)(1)(0)[/tex]
A.B = 0
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Which type of action forces cause a reaction force?
A. Only large action forces will cause a reaction force.
B. All forces cause a reaction force.
C. Only small forces cause a reaction force.
Answer:
B
from newton's law , for every action there is an equal and opposite reaction, regardless of the size of the force
The mass of the Sun is 1. 99 × 1030 kg. Jupiter is 7. 79 × 108 km away from the Sun and has a mass of 1. 90 × 1027 kg. The gravitational force between the Sun and Jupiter to three significant figures is × 1023 N.
The gravitational force is s type of force that has the ability to attract any two objects having mass. The gravitational force will be [tex]4.16\times10^{23}[/tex].
What is the gravitational force?The gravitational force is s type of force that has the ability to attract any two objects with mass. Gravitational force tries to pull two masses towards each other.
[tex]F= G\frac{m_1m_2}{r^{2} }[/tex]
Given,
mass of the sun ([tex]m_1[/tex])= [tex]1.99\times10^{23}[/tex] kg
mass of Jupiter([tex]m_2[/tex])= [tex]7.79\times10^{8}[/tex] kg
distance between the sun and Jupiter (r)= [tex]1.90\times10^{27}[/tex] m
[tex]F= G\frac{m_1m_2}{r^{2} }\\\\\\F=4.16\times10^{23}\times\frac{1.99\times10^{23}\times7.79\times10^{8}}{({1.90\times10^{27})^2} }[/tex]
[tex]F= 4.16\times(10)^{23}[/tex] Newton
Hence the gravitational force between the sun and Jupiter will be [tex]4.16\times10^{23}[/tex]
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HELP! how did michael jordan influence future basketball players to make prodcuts?
Answer:
By encouraging them.
Explanation:
#CARRYONLEARNING
Answer:
His ability to soar to the basket and do things we'd never before seen captured the world's attention and helped make basketball more of a global sport than it had ever been. His reverse layups, slam dunks, and fadeaway shots were exciting to say the least.
Explanation:
Describe Pulse wave. Short description
What do you think causes such change in wave velocity?
Example: Increasing the tension in A string causes the speed of waves on the string to increase. Since the wavelengths of the standing waves remains constant, this results in a larger frequency of oscillations in the string, which we percieve as a higher pitch when the string vibrates the air.
list 3 process that can change matter from one state to another
Answer:
evaporation, melting, freezing
Explanation:
matter is a solid, gas, or liquid
evaporation turns a liquid to gas
melting changes a solid to liquid
freezing changes a liquid to a solid
What is gravitational force
The force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface.
What is the standard unit used to measure mass?
Answer:
g or kg
Explanation:
Mass is typically measured in grams or in kilograms (1 kg = 1000 g)
Determine the change in velocity of a car that starts at rest and has a final velocity of
20 m/s north.
answer:
20-0
=20
Explanation:
from rest initial velocity is zero.
final velocity is 20
hence change in velocity is;
20-0
=20
The diameter of earth is largest when measured around the.
Answer:
equator
Explanation:
The diameter of earth is largest when measured around the equator, due to the equatorial bulge.
The equatorial bulge is a phenomenon caused by the Earth's diameter being wider in the Equator.
A straight line with its endpoints located on the edge of the circle and its center is used to calculate the diameter of a circle. Latitudes like the equator and the Arctic Circle have diameters that can be calculated by scientists.
The Equator is the place on Earth where it is the broadest. At the equator, the circumference of the Earth is 40,075 km.
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A swimmer jumps from a diving board 7 m above the level of water with an initial horizontal velocity of 5 m/s. The total time taken to reach the water is:
Answer:
here's the answer to your question hope it helps you
Explanation:
time=distance/speed
=7m/5ms
=1.4s
What is the key difference between photoheterotrophs and photoautotrophs?.
Explanation:
What is the key difference between photoheterotrophs and photoautotrophs? Photoheterotrophs use organic compounds as their carbon source; photoautotrophs use carbon dioxide as their carbon source.
this is for my physical science class.
Which kind of wave is a wave on the electromagnetic spectrum?
a. matter wave
b. longitudinal wave
c. mechanical wave
d. transverse wave
Answer:
It is a transverse wave. The other types of waves require a physical medium (air, water, etc.) for transmission.
how do animal weather rocks
Answer:
Burrowing animals can cause weathering. By digging for food or making space to live in the animal may break apart rock. The growing roots of a tree can also break apart rock.
The brightness of a light bulb is most closely related to
a ) Its resistance
b) The current through it
c) The voltage drop across it
d) The power dissipated by it.
Answer:
a ) Its resistance
Explanation:
It depends on current and resistance
Make the following conversion.
0.0097 mg = _____ g
your answer would be 9.7
Answer:
0.0097 mg = 9.7e-9 g
Explanation:
what is represented using a free body diagram
Answer:
a free body diagram (FBD; also called a force diagram) is a graphical illustration used to visualize the applied forces, moments, and resulting reactions on a body in a given condition.
What is the time period of a 40 Hz wave?
Answer:
0.025 secs
Explanation:
Answer:
The formula for time is: T (period) = 1 / f (frequency). λ = c / f = wave speed c (m/s) / frequency f (Hz). The unit hertz (Hz) was once called cps = cycles per second.
Explanation:
~Cornasha_Weeb
A motor pushes a car with a force of 35 N for a distance of 350 m in 6 s.
a. How much work has the motor accomplished?
Answer:
2041.66666667
Explanation:
35 N → 350 METERS for 6 seconds
force distance
350 M / 6s = 58.3
58.3 x 35 N = 2041.66666667 work
SOLVE IT NOWPLS!
its AP Q
Answer:
B. the maximum velocity of the mass
Explanation:
The maximum velocity occurs at the equilibrium position (x=0) when the mass is moving toward x=+A .
How long did it take for the dinosaurs to die after the asteroid?.
Answer:
it's estimated to within a couple of thousands of years.
Explanation:
For a long time it was thought that the dinosaurs died out 65 million years ago. But Paul explains, 'The dating of those layers of clay around the world is very accurate.
What direct method of generating electricity?
For Me Is "Hydropower."
Because Hydropower is most efficient method of generating electricity because 95 per cent of the energy of flowing water gets converted into electricity—only five per cent of the energy is converted into other forms of energy.
A cannon fires a cannonball directly upwards at +150m/s. How long does it take for the cannonball to reach maximum height?
Why are yet planes faster tharn. cargo planes?
Answer:
cargo planes hold cargo so there hevier
Explanation:
How is electricity generated and transmitted to provide electricity to homes.
Answer:
Electricity generated at the power plant reaches our homes through multiple substations, transmission and distribution lines, and transformers. Newly generated electricity is transmitted at extremely high voltages ranging from 275,000 to 500,000 volts in order to reduce transmission losses.A 2.60 kg block is in equilibrium on an incline
of 24.3◦
.
The acceleration of gravity is 9.81 m/s
2
.
What is Fn of the incline on the block?
Answer in units of N.
Answer:
W = m g = 2.60 * 9.81 = 25.5 N weight of block
Fn = W cos theta = 25.5 N * cos 24.3 = 23.2 N normal force of plane