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3 years ago

Find the x-component of this

Physics

1 answer:

Sholpan [36]3 years ago

5 0

Answer: 74.8m

Explanation:

We have the vector defined by:

r = 101m

θ = 42.2°

When we want to write this as rectangular components, we have that:

x = r*cos(θ)

y = t*sin(θ)

this is because we can construct a triangle rectangle, where the module of the vector is the hypotenuse, the x component is the adjacent cathetus and the y component is the opposite cathetus.

Then, here we have that the x component is

x = 101m*cos(42.2°) = 74.8m

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A bullet with a mass of 0.00658 kg is fired through a 1.95 kg block of wood on a frictionless surface. The initial speed of the

Svetradugi [14.3K]

The final velocity of the block is 1.29 m/s

Explanation:

We can solve this problem by using the principle of conservation of momentum: in fact, the total momentum of the system must be conserved before and after the collision. Therefore, we can write:

$p_i = p_f\\m_1 u_1 + m_2 u_2 = m_1 v_1 + m_2 v_2$

where:

$m_1 = 0.00658 kg$ is the mass of the bullet

$u_1 = 822 m/s$ is the initial velocity of the bullet

$v_1 = 439 m/s$ is the final velocity of the bullet

$m_2 = 1.95 kg$ is the mass of the block

$u_2 = 0$ is the initial velocity of the block

$v_2$ is the final velocity of the block

Re-arranging the equation and solving for v2, we find:

$v_2 = \frac{m_1 u_1 - m_1 v_1}{m_2}=\frac{(0.00658)(822)-(0.00658)(439)}{1.95}=1.29 m/s$

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3 years ago

Which statement describes the role of a resistor in an electrical circuit?

Arisa [49]

The role of a resistor in an electrical circuit is to hinder the movement of charge through a circuit

Explanation:

A charge is carried through a wire by current (indicated as I in physics S.I connotation). Higher current means the rate at which the charge is flowing through the wire is fast. High resistance of the wire means the charge flows with difficulty hence slower. Resistance is given by the formulae;

R = V/I whereby;

R = resistance

V = voltage

I = current

As you can observe R (resistance) is inversely proportional to I (current). Meaning the higher the resistance the lower the current.

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3 years ago

The temperature of a 50 g sample of aluminum is raised from 20°c to 60°c when 440 cal of heat are added. the specific heat capac

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40 percent is how much aluminum is added

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3 years ago

A circuit is built based on this circuit diagram. What is the equivalent resistance of the circuit?

Dmitry_Shevchenko [17]

The three resistors are connected to the same points of the circuit, so they are in parallel configuration. The equivalent resistance of 3 resistors in parallel is given by:
$\frac{1}{R_{eq}}= \frac{1}{R_1}+ \frac{1}{R_2}+ \frac{1}{R_3}$
If we plug the values of the resistances into the formula, we find
$\frac{1}{R_{eq}}= \frac{1}{3.0 \Omega}+ \frac{1}{6.0 \Omega}+ \frac{1}{9.0 \Omega}= \frac{6+3+2}{18.0 \Omega} = \frac{11}{18.0 \Omega}$
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So, the correct answer is B.

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3 years ago

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I think its c I really don't take physics but I try to help.

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3 years ago