[ad_1]

Get college assignment help at uniessay writers A projectile is fired at an upward angle of 45° from the top of a 215 m cliff with a speed of 154 m/s. What will be its speed when it strikes the ground below?

A horizontal pipe contains water at a pressure of 150 {rm kPa} flowing with a speed of 1.3 {rm m/s}. The pipe narrows to one-half its original diameter. What is the speed of the water?

An atwood machine consist of two unequal masses connected by a cord that passes over a pully. If m1=6.0 kg and m2=5.0 kg, what is the acceleration of the masses? (assume the pulley and cord are frictionless and masses).

Part 1: To move a refrigerator of mass 130 kg into a house, a mover puts it on a dolly and covers the steps leading into the house with a wooden plank acting as a ramp. The plank is 6.9 m long and rises 1.2 m. The mover pulls the dolly with constant velocity and with a steady force 280 N up the ramp. How much work does he perform? The acceleration of gravity is 9.8 m/s2 . Answer in units of J. Part2: What is the minimal work required to lift the refrigerator into the house? Answer in units of J.

A female gymnast weighs 400 N. If she is hanging stationary from a high bar, how many forces are acting on her?

the largest block in the great pyramid wiegh 15 ton (about 13,000 kg). Dragging such a block up a ramp with a mechanical advantage of 3 would require a force of 4.5*10^4n.if 9.0*10^5 j of work was done on the block to move it up the ramp neglecting fraction how far was the block moved?

A force of 7 pounds is required to hold a spring stretched 0.5 feet beyond its natural length. How much work (in foot-pounds) is done in stretching the spring from its natural length to 0.9 feet beyond its natural length?

A long horizontal wire carries a current of 48 A. A second wire, made of 1.00-mm-diameter copper wire and parallel to the first, is kept in suspension magnetically 5.0 cm below (Fig. 28–57). (a) Determine the magnitude and direction of the current in the lower wire. (b) Is the lower wire in stable equilibrium? (c) Repeat parts (a) and (b) if the second wire is suspended 5.0 cm above the first due to the first’s magnetic field.

Suppose that the microwave radiation has a wavelength of 11.6 cm. How many photons are required to heat 285 mL of coffee from 25.0 ^circ rm C to 62.0 ^circ rm C? Assume that the coffee has the same density, 0.997 g/mL, and specific heat capacity, 4.184 rm J/(gcdot K), as water over this temperature range.

A speedboat starts from rest and accelerates at 2.01 m/s2 for 7.05 s. At the end of this time, the boat continues for an additional 5.65 s with an acceleration of 0.518 m/s2. Following this, the boat accelerates at -1.49 m/s2 for 7.80 s.

Get college assignment help at uniessay writers a torque of 110 Nm is required to start a revolving door rotating. If a child can push with a maximum force of 90 N, how far from the door’s rotation axis must she apply this force?

An asteroid in an elliptical orbit about the Sun travels at 1.2 x 106 m/s at perihelion (the point of closest approach) at a distance of 2.0 x 108 km from the Sun. How fast is it traveling, in m/s, at aphelion (the most distant point), which is 8.0 x 108 km from the Sun? Hint: Use conservation of momentum.

A 300 kg piano slides 4.1 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40. Calculate the force exerted by the man.

A projectile is fired at an upward angle of 45° from the top of a 257 m cliff with a speed of 157 m/s. What will be its speed when it strikes the ground below?

A 67.0 firefighter climbs a flight of stairs 22.0 high. How much work is required?

A 260 kg piano slides 4.2 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40. Calculate the force exerted by the man

A block of iron, completely submerged under water, is suspended from one end of an equal-arm balance by a thin wire. To balance the scales, 2.55 kg are needed on the scale pan at the other end. What is the volume of the block? (density of iron is 7.86*10^3 kg/m^3)

point where the Moon’s gravi- tational pull is stronger than that of Earth’s. Determine the distance of this point from the center of the Earth. The masses of the Earth and the Moon are respectively 5.55 × 1024 kg and 7.36×1022 kg. The distance from the Earth to the Moon is 3.81 × 108 m. Answer in units of m.

Light with a frequency of 5.60×1014 travels in a block of glass that has an index of refraction of 1.52.

A projectile is fired at an upward angle of 45° from the top of a 311 m cliff with a speed of 217 m/s. What will be its speed when it strikes the ground below

Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.70×10^6 N, one at an angle 17.0 degrees west of north, and the other at an angle 17.0 degrees east of north, as they pull the tanker a distance 0.600 km toward the north.

The post A projectile is fired at an upward angle of 45° from appeared first on uniessay writers.

[ad_2]

Source link

November 3, 2019