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Get college assignment help at uniessay writers Need help on these questions

One of the tenets of the pseudoscience (i.e., “false science”) of

One of the tenets of the pseudoscience (i.e., “false science”) of astrology is that, in some mysterious way, the positions of the planets at the time of a person’s birth somehow influence the characteristics of that person. To see if this proposition seems plausible, let us compare the gravitational influence of Mars when it is closest to earth with the gravitational influence of the medical doctor who delivers a baby. For a rough calculation, we shall assume that the doctor is 50.0 from the baby (she is likely to be even closer at delivery), has a mass of 75.0 , and can be modeled as a uniform sphere. Calculate the ratio of the gravitational force the doctor exerts on the baby to the gravitational force that Mars exerts on the baby.

A 0.30 kg softball has a velocity of 12 m/s at

A 0.30 kg softball has a velocity of 12 m/s at an angle of 35

After a 0.380-kg rubber ball is dropped from a height of

After a 0.380-kg rubber ball is dropped from a height of 1.90 m, it bounces off a concrete floor and rebounds to a height of 1.45 m (a) Determine the magnitude and direction of the impulse delivered to the ball by the floor. (b) Estimate the time the ball is in contact with the floor to be 0.06 seconds. Calculate the average force the floor exerts on the ball.

A projectile is fired at an upward angle of 45° from

A projectile is fired at an upward angle of 45° from the top of a 227 m cliff with a speed of 170 m/s. What will be its speed when it strikes the ground below? (Use conservation of energy.)

A shell is fired from the ground with an initial speed

A shell is fired from the ground with an initial speed of 1.67 103 m/s at an initial angle of 30° to the horizontal. (a) Neglecting air resistance, find the shell’s horizontal range. m

A slingshot fires a pebble from the top of a building

A slingshot fires a pebble from the top of a building at a speed of 20.0 m/s. The building is 28.0 m tall. Ignoring air resistance, find the speed with which the pebble strikes the ground when the pebble is fired (a) horizontally, (b) vertically straight up, and (c) vertically straight down.

A 23 {rm kg} child goes down a straight slide inclined

A 23 {rm kg} child goes down a straight slide inclined 38degrees above horizontal. The child is acted on by his weight, the normal force from the slide, and kinetic friction.

How far can the center of the box be from the

How far can the center of the box be from the end of the table before the board begins to tilt?

A thin 3.00 box rests on a 6.00 board that hangs

A thin 3.00 box rests on a 6.00 board that hangs over the end of a table, as shown in the figure. How far can the center of the box be from the end of the table before the board begins to tilt?

Ball A has a mass of 1.1 kg and moves with

Get college assignment help at uniessay writers Ball A has a mass of 1.1 kg and moves with an initial speed of 12.5 m/s. It collides with stationary balls B and C, whose centers are on a line perpendicular to the initial velocity of ball A and that are initially in contact with one-another. Balls B and C are identical and have a mass of 0.5 kg. After the collision, balls B and C have the same speed, 4.2 m/s, but ball B moves at an angle of 22 above the horizontal and ball C moves at an angle of 22 below the horizontal. What is the velocity of ball A after the collision?

What is the magnitude of the apparent weight of a 80

What is the magnitude of the apparent weight of a 80 kg astronaut 5200 km from the center of the Earth’s Moon in a space vehicle moving at constant velocity?

a 1200 kg car is rolling on a horizontal surface with

a 1200 kg car is rolling on a horizontal surface with a speed of 40 km/he when it strikes a spring-loaded guard rail. neglecting any losses due to friction, find the maximum distance the spring is compressed. assume the spring constant is 10^6 n/m.

) A floodlight with a mass of 20 kg is used

) A floodlight with a mass of 20 kg is used to illuminate the parking lot. The floodlight is supported at the end of a horizontal beam that is hinged to a vertical pole as shown in the figure below. A cable that makes an angle of 30° with the beam is attached to the pole to help support the floodlight. Find the following, assuming the mass of the beam is negligible when compared with the mass of the floodlight. A) The force provided by the cable. B) The horizontal and vertical forces exerted on the beam by the pole.

After a 0.300-kg rubber ball is dropped from a height of

After a 0.300-kg rubber ball is dropped from a height of 1.75 m, it bounces of a concrete floor and rebounds to a height of 1.50 m. Determine the magnitude and direction of the impulse delivered

A 600 ball swings in a vertical circle at the end

A 600 ball swings in a vertical circle at the end of a 1.2-m-long string. When the ball is at the bottom of the circle, the tension in the string is 19 .

The initial speed of school bus is 10.0 m/s. If the

The initial speed of school bus is 10.0 m/s. If the bus slows down to 2.0 m/s in 1 seconds what is the acceleration (positive or negative) of the bus?

Suppose we have an infinitely long wire carrying a current of

Suppose we have an infinitely long wire carrying a current of 2.0 A. It is bent into an L-shape extending into positive infinities along the x- and y- axes. Find the magnitude of the magnetic field at a point P with coordinates (0.3 m, 0.3 m).

A rocket moves upward, starting from rest with an acceleration of

A rocket moves upward, starting from rest with an acceleration of 33.4 m/s2 for 3.47 s. It runs out of fuel at the end of the 3.47 s but does not stop. How high does it rise above the ground?

If you weigh 660 N on the earth, what would be

If you weigh 660 N on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter of 20.0 km? Take the mass of the sun to be = 1.99×10^30, the gravitational constant to be = 6.67×10^−11 , and the acceleration due to gravity at the earth’s surface to be = 9.810 m/s^2

The tallest volcano in the solar system is the 22 km

The tallest volcano in the solar system is the 22 km tall Martian volcano, Olympus Mons. An astronaut drops a ball off the rim of the crater and that the free fall acceleration of the ball remains constant throughout the ball’s 22 km fall at a value of 3.6 m/s2. (We assume that the crater is as deep as the volcano is tall, which is not usually the case in nature.) Find the time for the ball to reach the crater floor.

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