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
Ksivusya [100]
4 years ago
6

A small rectangular block of metal must be a magnet is it

Physics
1 answer:
Arlecino [84]4 years ago
3 0
D. Is repelled by a magnet
You might be interested in
Can a goalkeeper at her/ his goal kick a soccer ball into the opponent’s goal without the ball touching the ground? The distance
PSYCHO15rus [73]

Answer:

No she cannot.

Explanation:

Let v_h be the horizontal component of the ball velocity when it's kicked, assume no air resistance, this is a constant. Also let v_v be the vertical component of the ball velocity, which is affected by gravity after it's kicked.

The time it takes to travel 95m accross the field is

t = 95 / v_h or v_h = 95/t

t is also the time it takes to travel up, and the fall down to the ground, which ultimately stops the motion. So the vertical displacement after time t is 0

s = v_vt + gt^2/2= 0

where g = -9.8m/s2 in the opposite direction with v_v

v_vt - 4.9t^2 = 0

v_vt = 4.9t^2

v_v = 4.9t

Since the total velocity that the goal keeper can give the ball is 30m/s

v = v_v^2 + v_h^2 = 30^2 = 900

(4.9t)^2 + \left(\frac{95}{t})^2 = 900

24.01t^2 + \frac{9025}{t^2} = 900

Let substitute x = t^2 > 0

24.01 x + \frac{9025}{x} = 900

We can multiply both sides by x

24.01 x^2 + 9025 = 900x

24.01x^2 - 900x + 9025 = 0

t= \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

t= \frac{900\pm \sqrt{(-900)^2 - 4*(24.01)*(9025)}}{2*(24.01)}

As (-900)^2 - 4*24.01*9025 = -56761 < 0

The solution for this quadratic equation is indefinite

So it's not possible for the goal keeper to do this.

6 0
3 years ago
A watermelon is blown into three pieces by a large firecracker. Two pieces of equal mass m fly away perpendicular to one another
laiz [17]

Answer

given,

watermelon blown into three pieces

two pieces of mass m

both pieces speed = v = 31 m/s

mass of third piece = 3 m

using conservation of mass

0 = m V \hat{i} + m V \hat{j} + (3\ m)V_3

V_3 = \dfrac{V}{3}(-\hat{i}-\hat{j})

V_3 = \dfrac{V}{3}\sqrt{1^2+1^2}

V_3 = \dfrac{V}{3}\sqrt{2}

velocity of third component

V_3 = \dfrac{31}{3}\sqrt{2}

V_3 = 14.61\ m/s

angle

\theta = tan^{-1}(\dfrac{-1}{-1})

\theta = tan^{-1}(1)

\theta = 45^0

5 0
4 years ago
The graph shows a heating curve for water. Between which points on the graph would condensation occur?
Effectus [21]

Answer:

Between R and S

Explanation:

4 0
3 years ago
Peter left town A at 13:30 and travelled towards town B at an average speed of 40mph. At 13:45 Philip left town A for town B at
skad [1K]

Answer:

fbddb

Explanation:

dsbse

8 0
3 years ago
What is the change in the cell voltage when the ion concentrations in the cathode half-cell are increased by a factor of 10?
VMariaS [17]
When the ion concentrations in the cathode half-cell are increased by a factor of 10, the change in the cell voltage is ln10 times greater. This comes from the Nernst equation. Use variation to solve for the cell voltage in terms of the initial cell voltage before increasing the ion concentrations by 10.
8 0
4 years ago
Read 2 more answers
Other questions:
  • Considering thermal equilibrium in your answer, explain why some materials feel different temperatures.
    9·1 answer
  • Who's really good at physical science?
    8·1 answer
  • a stone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is
    10·1 answer
  • The magnetosphere protects Earth from _____. a.solar radiation b. the solar wind c. the cold of space d.asteroid hits e.gamma ra
    6·2 answers
  • Which of the following is the best prediction of what would happen if the distance across section 1 in the diagram were to decre
    9·1 answer
  • a pitcher throws a 0.35 kg ball, giving it an acceleration of 10.0 m/s. what would the acceleration be, if the pitcher threw the
    5·1 answer
  • You need to repair a broken fence in your yard. The hole in your fence is around 3 meters in length and for whatever reason, the
    10·1 answer
  • The instrument panel in a car usually has a display in units of kilometres or miles per hour. The displayed value tells you whic
    8·1 answer
  • Help! Will Mark Brainliest!
    13·1 answer
  • Which statement explains how the charges on objects determine the electric force between them? (1 point)
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!