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
sergeinik [125]
3 years ago
15

An 80-kg hiker climbs to the top of a tall hill and builds up 470,000 J of gravitational potential energy. How high did the hike

r climb?
Physics
2 answers:
Nataly_w [17]3 years ago
6 0

Answer:

599.5 m

Explanation:

The gain in gravitational potential energy of the man is given by:

\Delta U=mg\Delta h

where

m is the man's mass

g is the gravitational acceleration

\Delta h is the change in height of the hiket

In this problem, we have the following data:

U = 470,000 J

g = 9.8 m/s^2

m = 80 kg

Solving the formula for \Delta h, we find:

\Delta h = \frac{U}{mg}=\frac{470,000}{(80)(9.8)}=599.5 m

Alik [6]3 years ago
4 0

Answer:

600

Explanation:

You might be interested in
A hot–air balloon is moving at a speed of 10.0 meters/second in the +x–direction. The balloonist throws a brass ball in the +x–d
Ad libitum [116K]

Answer:

Option (D) is correct.

Explanation:

The balloon lands horizontally at a distance of 420 m from a point where it as released.

Velocity of air balloon along +X axis =10 m/s

velocity of ball=4 m/s along + X axis

the velocity of balloon gets added to the velocity of ball. So the resultant velocity of the balloon=10+4 = 14 m/s

time taken= 30 s

The distance traveled is given by d= v t

d= 14 (30)

d= 420 m

Thus the balloon lands horizontally at a distance of 420 m from a point where it as released.

6 0
3 years ago
On a safety test course, a 1000 kg car heading north at 5 m/s collides head-on with an 800 kg car heading south at 4 m/s. At the
Luden [163]

Answer:

The speed is 3.5\frac{m}{s} and the direction is heading north.

Explanation:

In collisions the force exerted by the objects that collide is higher enough than the external forces that we can neglect that external forces, with that assumption we can use the conservation fo momentum law that states, final total momentum (pf) is equal initial total momentum (pi) if there’re not external forces or they are small enough to be neglected. Mathematically:

p_f=p_i

The total momentum is the sum of the momentum of each of the bodies we're dealing, in our case the moment of each car, then:

p_{nf}+p_{sf}=p_{ni}+p_{si}

with pn the momentum of the 1000kg car heading north and ps the 800kg car heading south. Momentum is defined as mass times velocity, then:

m_nv_{nf}+m_sv_{sf}=m_nv_{ni}+m_sv_{si} (1)

It's important to note that when we talk about momentum and velocity direction matters, so we're are going to choose a system of reference where quantities pointing north are positive and pointing south are negative. So, the initial velocity of 1000 kg car is vni=5 m/s, initial velocity of 800 kg car is vsi=-4 m/s and the final velocity of 1000 kg car is vnf=-1 m/s. Now we can solve (1) for vsf and use the values we already have:

v_{sf}=\frac{m_nv_{ni}+m_sv_{si}-m_nv_{nf}}{m_s}=\frac{(1000)(5)+(800)(-4)-(1000)(-1)}{800}

v_{sf}=3.5\frac{m}{s}

Because the sign is positive the direction is to heading north.

7 0
3 years ago
I need help on number 6 pls due today
Natalija [7]

Explanation:

Graph A matches description 4 because the car is coming back.

Graph B matches description 3 because the speed of the car is decreasing.

Graph C matches the description 2 because the car is traveling at a constant rate.

Graph D matches the description 1 because the car is stopped.

3 0
3 years ago
Pls qmp
AVprozaik [17]

Answer: I put the importance of the lab in the topic is to find how dense an object is and if it can sink or float and it's important to answer the question so you can also find mass and volume.

Explanation: I dunno haha...

8 0
3 years ago
Explain why the nucleus is very dense BRAINLIEST
Oksana_A [137]
Size and Mass of the Nucleus
Electrons have virtually no mass, but protons and neutrons have a lot of mass for their size. As a result, the nucleus has virtually all the mass of an atom. Given its great mass and tiny size, the nucleus is very dense.
8 0
3 years ago
Other questions:
  • On which date is the gravitational force between Earth and the moon the greatest?
    9·1 answer
  • Three children are riding on the edge of a merry-go-round that is 100 kg, has a 1.60-m radius, and is spinning at 20.0 rpm. The
    9·1 answer
  • A camcorder has a power rating of 15 watts. If the output voltage from its battery is 5 volts, what current does it use?
    15·1 answer
  • One way to describe a wave crest is the amount of ___________ applied over an area.
    5·2 answers
  • Which change would cause the largest increase in a mountain climber’s gravitational potential energy?
    8·2 answers
  • If the effects of heat and friction are ignored, the amount of work output is always _______ the amount of work input, even when
    7·1 answer
  • In humans, which part of the brain contains 80 percent of its weight? cerebrum cerebellum spiral cord brain stem
    8·1 answer
  • How would you classify an EM wave with a frequency of 10^7 Hz?
    7·1 answer
  • How is the density of water different from the densities of most other substances?
    8·1 answer
  • in which of the following collisions would you expect the kinetic energy to be conserved? a. a bullet passes through a block of
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!